单项选择题

The room was lighted ______ electric light.

A．by
B．to
C．in
D．with
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单项选择题
I saw ______ of flies on the table.
A．a group of
B．a flock of
C．a herd of
D．a drove of
单项选择题
Only after ______ made hundreds of experiments ______ succeed in solving the problem.
A．they had; did they
B．had they; they did
C．they had; they did
D．had they; did they
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