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I when you rang me up last night.A.must be sleepingB.must have sleptC.must have

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I when you rang me up last night.A.must be sleepingB.must have sleptC.must have

I ________ when you rang me up last night.

A.must be sleeping

B.must have slept

C.must have been sleeping

D.must have been slept

试题答案

C