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
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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
单项选择题
The government is trying to do something to ______ better understanding between the two countries.
A．raise
B．promote
C．heighten
D．increase
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