单项选择题

Only in this way ______ this difficult math problem.

A．we can solve
B．can we solve
C．do we solve
D．we will solve
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单项选择题
The road is wet. It ______ last night.
A．should have rained
B．must have rained
C．could have rained
D．must rain
单项选择题
He does not know ______ to deal with the matter and is very worried.
A．what
B．that
C．how
D．as
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