Often when he______have been doing something that was given him, he wasted his t

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问题 Often when he______have been doing something that was given him, he wasted his time drawing little pictures.

选项 A、must
B、need
C、should
D、would

答案 C

解析 should have done或should have been doing…表示应该(在)做某事而实际没做。must have been doing…"(过去)一定在做……"，表示对过去的肯定推测。

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