—You look very pale. You __________ very tired. — I didn ’ t sleep at all last night.
A. must be
B. must have been
C. can be
D. can have been
正确答案：A
参考解析：暂无解析
—You look very pale. You __________ very tired. — I didn ’ t sleep at all last night.
A. must be
B. must have been
C. can be
D. can have been
正确答案：A
参考解析：暂无解析
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