The pupils here ______ all kinds of exercises every day in the past four weeks.A.kept busy doing The pupils here_all kinds of exercises every day in the past four weeks.A.kept busy doing B.keep on doingC.have kept busy doing D.have been kept busy doi

The pupils here ______ all kinds of exercises every day in the past four weeks.A.kept busy doing The pupils here_all kinds of exercises every day in the past four weeks.A.kept busy doing B.keep on doingC.have kept busy doing D.have been kept busy doi
The pupils here ______ all kinds of exercises every day in the past four weeks.A.kept busy doing
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.
选什么,为什么

The pupils here ______ all kinds of exercises every day in the past four weeks.A.kept busy doing The pupils here_all kinds of exercises every day in the past four weeks.A.kept busy doing B.keep on doingC.have kept busy doing D.have been kept busy doi
正确答案是 D
every day in the past four weeks 意为：在过去的四个星期中的每一天
in the past four weeks 此时间状语常用于完成时态,故可排除 A 跟 B
pupils（小学生）不会是自己在四个星期的每一天做各种各样的 exercises （这个用复数的,是练习,不是运动）,他们是“被迫的”,应用被动语态,故排除 C ,正确答案是 D .

选C。
这是主动语态，排除D；
其次，keep on doing sth.表示的是继续做某事，而且此处时态是完成时（in the past four weeks），从这里就排除了B和A

D.have been kept busy doing.
every day 表明是现在时。 A过去不对。
in the past four weeks. 段时间，完成，B不对。
这的学生们，过去四周以来一直都是，每天都在做各式各样的运动。
显然是现在完成进行时，
因为学生们是 被 让着做这些事的。
keep the pupils doing <...

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D.have been kept busy doing.
every day 表明是现在时。 A过去不对。
in the past four weeks. 段时间，完成，B不对。
这的学生们，过去四周以来一直都是，每天都在做各式各样的运动。
显然是现在完成进行时，
因为学生们是 被 让着做这些事的。
keep the pupils doing
同学做主语， 变成：the pupils be kept doing
所以C也不对。

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