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
Under no circumstances（）leave his post.

A. a soldier mustn't
B. a solider must
C. mustn't a soldier
D. must a solider
单项选择题
He bought her what she wanted,（）the fact that they were costly.

A. even if
B. as though
C. only if
D. regardless of
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