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
（）the temperature,（）water turns into steam.

A. The high, the fast
B. Higher, faster
C. The more higher, the faster
D. The higher, the faster
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
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