单项选择题

I'm used to driving in Hong Kong now, but it（）hard at the beginning.

A. is
B. was
C. had been
D. has been

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单项选择题

If Tim keeps working hard like this, he'll（）sooner or later.

A. break down
B. give up
C. get down
D. hold on

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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