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—I called you at 9 last night,but no one answered.
—Sorry,I ________ sleeping.I went to bed very early.
A.need have beenB.would have been
C.must have beenD.should have been
C
解析 根据答语中的“I went to bed very early”可知,此处为肯定推测,用must,表示问话人打电话时,答话人一定正在睡觉。must have done表示过去肯定做了某事。
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