225. I didn’t hear the phone last night. I asleep. A. must beB. must have beenC. should be

问题补充：

225. I didn’t hear the phone last night. I asleep.

A. must be

B. must have been

C. should be

D. should have been

答案：

A. must be

(答案→)B. must have been

C. should be

D. should have been

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