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
（） got in the wheat than it began to rain heavily.

A．No sooner had they
B．No sooner have they
C．No sooner they
D．No sooner they had
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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