2. 外语
  3. -- You look very pale. You ______ very tired.-- I didn’t sleep at all last night.

-- 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 根据语境，此处指对现在情况把握较大的推测，用must be形式。
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