单项选择题

（）he is still young, he is going very grey.

A. As long as
B. As
C. While
D. Even

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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

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

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