题目

It was the third time that he __________________ (得知) the changes of the meeting. (inform) 答案：had been informed of清朝康熙到乾隆年间，经济迅速恢复，国力空前强盛，史称A．“开皇之治” B．“贞观之治”C．“开元盛世” D.“康乾盛世”