单项选择题

Everything is in great ______ in the countries suffering from the war.

A. ask
B. requirement
C. demand

D. request
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单项选择题
They repeated the experiment several times ______ they were sure that the result was reliable.
A) until
B) for
C) since
D) when
单项选择题
I apologized______Lily for interrupting her.
A) at
B) to
C) for
D) with
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