---I called you last night, but nobody answered the phone. ---Sorry, . A. I must be s——青夏教育精英家教网—

摘要： ---I called you last night, but nobody answered the phone. ---Sorry, . A. I must be sleep at that moment. B. I must have slept at that moment. C. I must have been asleep at that moment. D. I must have fallen asleep at that moment.

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--- I called you last night, but nobody answered the phone.

--- Sorry, ________.

A. I must be sleep at that moment. B. I must have slept at that moment.

C. I must have been asleep at that moment. D.I must have fallen asleep at that moment.

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