单项选择题

______ is often more difficult to find trained men than to get financial support for scientific research.

A. It
B. That
C. This
D. What
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The doctor advised that he ______ smoking immediately.
A. stops
B. stopped
C. stop
D. will stop
单项选择题
Some people have nothing to eat, ______ others eat too much.
A. until
B. unless
C. while
D. if
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