单项选择题

That is the key______solving the problem.

A.at
B.to
C.for
D.in
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单项选择题
Over sixty percent of the church______destroyed during a bomb (炸弹) attack in the second World War.
A.have been
B.has been
C.was
D.were
单项选择题
He was only an office boy before______the position.
A.being appointed
B.appointed
C.appointing
D.having appointed
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