单项选择题

The room is in a terrible mess; it ______ cleaned.

A．can’t have been
B．mustn’t have been
C．shouldn’t have been
D．wouldn’t have been
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单项选择题
The police ______ that he committed a series of crimes in the north of the city.
A．swelled
B．submitted
C．surveyed
D．suspected
单项选择题
I have kept that portrait ______ I can see it every day, as it always reminds me of my university days in London.
A．which
B．where
C．whether
D．into
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