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Silk ______ one of the primary goods traded along the Silk Road by about 100 BC.

A . had become B . was becoming C . has become D . is becoming

—Did Linda see the traffic accident?

—No，no sooner ________ than it happened.

A . had she gone B . she had gone C . has she gone D . she has gone

He began to __________ because every means _______ tried already.

A . lose heart; has been B . lose heart; had been C . lose his heart; was D . lose his heart; had

Bob called to tell his mother that he couldn’t enter the house, for he ________ his key at school.

A . had left B . would leave C . was leaving D . has left

Not until ________ in the college entrance exam ________ that he had wasted much time using his mobile phone to surf the Internet and play games.

A . had he failed; he realized B . he had failed; he realized C . he had failed; did he realize D . did he fail; did he realize

By the time 2009, they__________ most parts of the project.

A . have finished B . had finished C . will have finished D . finished

By the 1920s, wolves had practically d(消失) from the Yellowstone area.

By the time we got to the station, the train (leave).

Though the AI program the top South Korean Go player only two months before, people were still confident that humans would win.

A . would defeat B . had defeated C . defeated D . defeat

By the time he_______ 20, he_______ 1 million pounds.

A . is; accumulated B . was; had accumulated C . was; has accumulated D . is; has accumulated

When she saw the man in the photo, she realized that she(see) him before.

Last night's TV news said that by then the death of the missing people yet.

A . wasn't proved B . hadn't been proved C . hasn't been proved D . didn't prove

Everything he ___ away from him before he returned to his hometown.

A . took B . had been taken C . had had been taken D . had taken

What worried me was that the baby who ______ his mother during his birth was still in ICU.

A . Loses B . lost C . has lost D . had lost

If their new safety system (put) to use, the accident would never have happened.

We were all laughing even though Daniel his joke yet. (not finish)

President Xi Jinping extended warm congratulations and sincere greetings to all members who had p in the Chang'e-5 mission. (根据首字母单词拼写)

His sudden departure had (说明) how unreliable he was.

I was sent to the village last month to see how the development plan (carry) out in the past two years.

It was the first time in a year and a half that she(see) the night face to face. (强调句、动词)

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