单项选择题

I（） asleep because it took me a long time to realize that the telephone was ringing.

A. could have fallen
B. should have fallen
C. must have fallen
D. mustn’t have fallen

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The two students talked as if they ______ friends for years.
A. should be
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单项选择题
The Bakers arrived last night. If they’d only let us know earlier, （） at the station.

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B. we’ll meet them
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D. we’ve met then
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