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Theyarebusytheirhomework.A.inTheyarebusytheirhomework.A.inB.onC.withD.for他们忙于他们的作业.是么.那是D么?

题目详情
They are busy ____their homework.A.in
They are busy ____their homework.
A.in B.on C.with D.for
他们忙于他们的作业.是么.那是D么?
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答案和解析
该题应该选C 考点为be busy with sth 忙于做某事,另一用法为
be busy doing sth.记住这两个短语就没问题了.