单项选择题

No sooner _____ he come into the house _____ it began to rain.

A．did; when
B．did; than
C．had; when
D．had; than
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单项选择题
There are some more topics to discuss, ______ the problem of pollution.
A．generally
B．especially
C．exactly
D．probably
单项选择题
_____ I admit that the problems are difficult, I don' t agree that they can' t be solved.
A．Suppose
B．Because
C．While
D．Until
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