单项选择题

（）for your advice, we' d never have been able to overcome the difficulties,

A．Had it not
B．If it were not
C．Had it not been
D．If we had not been

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单项选择题
Our company is（）of other makers of spare parts for the airplane.

A．in advance
B．ahead
C．abreast
D．in front
单项选择题
Since Helen is angry, we（）

A．had better leaving her alone
B．should leave her alone
C．might as well leave her alone
D．had rather leave her alone
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