单项选择题

We didn't know his telephone number, otherwise we ______ him.

A．had telephoned
B．must have telephoned
C．would telephone
D．would have telephoned
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单项选择题
The room is in a terrible mess; it ______ cleaned.
A．can't have been
B．shouldn't have been
C．mustn't have been
D．wouldn't have been
单项选择题
Criticism and self-criticism is necessary ______ it helps us to find and correct our mistakes.
A．by that
B．at that
C．on that
D．in that
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