单项选择题

George would certainly have attended the proceedings （）.

A．if he didn't get a flat tire
B．if the flat tire hadn't happened
C．had he not had a flat tire
D．had the tire not flattened itself

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单项选择题

The chairman requested that （）.

A．the members studies the problem more carefully
B．the problem would be more carefully studied
C．the members had studied the problem with more care
D．the problem be studied with more care

单项选择题

You could do it, if you （） try hard enough.

A．might
B．should
C．could
D．would