单项选择题

It is kind () you to do me a favor at this moment.

A. to
B. for
C. of
D. about

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单项选择题

You cannot see the patient at the moment; he is now () medical treatment.

A. in
B. on
C. under
D. at

单项选择题

The farmer felt the () of the bad weather for years.

A. effort
B. effect
C. efficient
D. effective

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