单项选择题

Many a girl ______ dancing and singing at the center of the stadium.

A．are
B．is
C．be
D．am
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单项选择题
More and more people realize we won't have clean water to drink unless something ______ soon.
A．was done
B．will be done
C．to be done
D．is done
单项选择题
He ______ the 8:25 train because he didn't leave home till 8:30.
A．couldn't have caught
B．ought to have caught
C．shouldn't have caught
D．mustn't have caught
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