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

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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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