单项选择题

The students was just about to ______ the question, when suddenly he found the answer.

A．arrive at
B．submit to
C．work out
D．give up
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单项选择题
We ______ our breakfast when an old man came to the door.
A．just have had
B．just had
C．have just had
D．had just had
单项选择题
We didn't know his telephone number, otherwise we ______ him.
A．would have telephoned
B．must have telephoned
C．would telephone
D．had telephoned
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