Question

【题目】We had finished all the new lessons ________ last month.

A. after B. by the time C. by the end of

Answer 1

【答案】C

【解析】

句意：到上个月月底，我们已经完成了所有的新课。句子是过去完成时，after在…之后，用于一般过去时; by the time of到…的时间，且本选项少了of, 不符合本句的句意; by the end of 到…的末尾，by the end of last month 到上个月月底，by +过去的时间，用于过去完成时，故选C。