单项选择题

I am rather concerned（）her, for I haven’t heard from her since last winter.

A. of
B. at
C. with
D. about

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单项选择题

There is no（）that women are playing an important role in the world today.

A. of deny
B. to denying
C. denying
D. of denying

单项选择题

Training astronauts（）not an easy thing.

A. are
B. is
C. were
D. be

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