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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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
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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