【題目】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＋時(shí)間段”的句子里，謂語動(dòng)詞要求用現(xiàn)在完成時(shí)。keep sb. busy doing sth.表示“使某人忙于……”，其被動(dòng)語態(tài)則為be kept busy doing sth.現(xiàn)在完成時(shí)態(tài)則為have been kept busy doing sth.。

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