You look tired. You ___________all day long.

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问题 You look tired. You ___________all day long.

选项 A、must have been working
B、might be working
C、should have been working
D、should have worked

答案A

解析 should have done表示“本应该做某事”，含有批评的意思在这里不符合题意，排除C项和D项。might be表示“可能是，或许是”，must be表示“一定是”。前句意思是：你看起来很疲劳。那么工作了整整一天应该是较肯定的猜测，所以A项是最佳答案。

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