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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单项选择题
The doctor advised that he ______ smoking immediately.
A．stops
B．stopped
C．stop
D．will stop
单项选择题
Next time I go there, I ______ them about what has happened recently.
A．ask
B．shall ask
C．asked
D．asks
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