题目内容
【题目】The pupils here________all kinds of exercises every day in the past four weeks.
A.kept busy doing
B.keep on doing
C.have kept busy doing
D.have been kept busy doing
【答案】D
【解析】在“in the last/past+时间段”的句子里,谓语动词要求用现在完成时。keep sb. busy doing sth.表示“使某人忙于……”,其被动语态则为be kept busy doing sth.现在完成时态则为have been kept busy doing sth.。
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