单项选择题

______ I admit that there are problems, I don't think that they cannot be solved.

A. Unless
B. Until
C. As
D. While
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单项选择题
This is an exciting area of study, and one ______ which new applications are being discovered almost daily.
A. from
B. by
C. in
D. through
单项选择题
If you know what the trouble is, why don't you help them to ______ the situation
A. simplify
B. modify
C. verify
D. rectify
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