单项选择题

The program requires more money than ______.

A．have been put in
B．being put in
C．has been put in
D．to be put in
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单项选择题
There is a real possibility that these animals could be frightened, ______ a sudden loud noise.
A．being there
B．should there be
C．there was
D．there have been
单项选择题
In the experiment we kept a watchful eye ______ the developments and recorded every detail.
A．in
B．at
C．for
D．on
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