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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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
Many manufacturers were accused of concentrating too heavily on cost reduction, often at the ______of the quality of their products.
A. expansion
B. exposure
C. expense
D. expectation
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