题目

I ___________ on the computer when Frank called me last night. A．work                     B．will work               C．was working           D．am working 答案：C 【详解】 句意：弗兰克昨晚打电话给我时，我正在用电脑工作。 考查过去进行时。work工作,动词原形；will work一般将来时；was working过去进行时；am working现在进行时。根据题干中“when Frank called me last night”可知此处表示当某件事情发生的时候，另一件事情正在进行，when引导的从句用一般过去时，主9．You_______if you had spoken the truth out. But you were as quiet as a mouse.A．mustn’t have been blamedB．shouldn’t be blamedC．wouldn’t have been blamedD．couldn’t be blamed