单项选择题

The house was very quiet, ______ as it was on the side of a mountain.

A．isolated
B．isolating
C．being isolated
D．having been isolated
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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
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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