—You look very pale. You______very tired. —I didn’t sleep at all last night.

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问题 —You look very pale. You______very tired. —I didn’t sleep at all last night.

选项 A、must be
B、must have been
C、can be
D、can have been

答案A

解析对现在情况的肯定推测，用must be形式。

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