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
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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
单项选择题
On a rainy day I was driving north through Vermont ______ I noticed a young man holding up a sign reading Boston .
A. which
B. where
C. when
D. that
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