单项选择题

If I （） harder at school, I would be sitting in a comfortable office now.

A．worked
B．were to work
C．had worked
D．were working

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单项选择题
If people feel hopeless, they don't bother to （）the skills they need to succeed.

A．adopt
B．acquire
C．accumulate
D．assemble
单项选择题
The careless man received a ticket for speeding. He （） have driven so fast.

A．can't
B．wouldn't
C．shouldn't
D．mustn't
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