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
As all the people of the world share one earth, industrial countries should be responsible for helping ______ and ______ countries.
A．developed... underdeveloped
B．developing... underdeveloping
C．developing... underdeveloped
D．developed... underdeveloping
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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
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