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The pupils here ______ all kinds of exercises every day in t

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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
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 .