单项选择题

As it turned out to be a problem of no importance, we ______ so much time looking into it.

A．needn't spend
B．didn't have to spend
C．oughtn't to spend
D．needn't have spent
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单项选择题
______ salary up by 25% ,the doctors and nurses in this hospital are very happy.
A．As
B．For
C．With
D．Through
单项选择题
It's too late to go out, ______ it's going to rain.
A．otherwise
B．besides
C．however
D．therefore
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