The pupils here_all kinds of exercises every day in the past

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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

选C.首先,这是主动语态,学生做各种练习,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；表示完成时的标志性的状语还有since（加时间点）、for（加时间段）,yet（一般用于疑问句和否定句中完成时）,句中有时会有already和ever等状语

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