题目内容
The pupils here_____ all kinds of exercises every day in the past few weeks.
- A.kept busy doing
- B.keep on doing
- C.have kept busy doing
- D.have been kept busy doing
D
keep sb.busy doings sth.表示"使某人忙于",完成时的被动形式应为have been kept busy doing sth.。
keep sb.busy doings sth.表示"使某人忙于",完成时的被动形式应为have been kept busy doing sth.。
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