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
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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
单项选择题
Will you lend me the book Yes, I ______ .
A．will
B．shall
C．can
D．may
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