He is very busy ______ or the term paper now.A、preparedB、being preparedC、to pr

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问题 He is very busy ______ or the term paper now.

选项 A、prepared
B、being prepared
C、to prepare
D、preparing

答案 D

解析 be busy doing sth.: 忙于干某事。其中，busy后接动名词doing。

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