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

If Tim keeps working like this, he'll () sooner or later.

A．break down
B．give off
C．get down
D．hold on

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