单项选择题

John could be a very excellent student but he ______ hard.

A. didn't work
B. wasn't working
C. doesn't work
D. hadn't worked
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单项选择题
This question admits ______ several answers.
A. for
B. with
C. of
D. to
单项选择题
The British are not so familiar with different cultures and other ways of doing things, ______ is often the case in other countries.
A. as
B. what
C. so
D. that
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