单项选择题

The experience（）in the war will be of great value to us.

A．to gain
B．gaining
C．gained
D．gain

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单项选择题
Her hair and coat were wet because it（）

A．would be raining
B．had been raining
C．would have been raining
D．had rained
单项选择题
As a biologist and ecologist, he is（）all forms of hunting.

A．against
B．down
C．back
D．off
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