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Be careful when the homework.A.doingB.doC.you doingD.you did

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Be careful when the homework.A.doingB.doC.you doingD.you did

Be careful when________ the homework.

A.doing

B.do

C.you doing

D.you did

试题答案

A

when/while doing sth. ,sb. …此句型中。前后主语一致。