单项选择题

Whether an operation should be performed in this case（）very much on the patient's general condition.

A. relies
B. counts
C. centers
D. depends

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单项选择题

It is reported that（）adopted children want to know who their natural parents are.

A. the most
B. most of
C. most
D. the most of

单项选择题

When I try to understand（）that prevents so many Americans from being as happy as one might expect, it seems to me that there are two reasons.

A. why it does
B. what it does
C. what it is
D. why it is

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