单项选择题

Please go and make sure __________ you get a receipt.

A．that
B．if
C．how
D．why
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单项选择题
A: We went to Italy for a holiday last year.B: That __________ nice.
A．can be
B．must be
C．must have been
D．can’t have been
单项选择题
We __________ TV last night when suddenly the lights went out.
A．watched
B．were watching
C．had watched
D．had been watching
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