单项选择题

By the end of this semester, we surely ______ a satisfactory solution to the problem.

A. have found
B. will find
C. will have found
D. are finding
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单项选择题
______the 1990's that the trade between the two countries reached its highest point.
A. During
B. It was in
C. That it was in
D. It was
单项选择题
This is the small village______our president was born．
A．which
B．where
C．that
D．as
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