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
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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
单项选择题
Most children in Great Britain are educated at the public ______.
A．cost
B．payment
C．expense
D．charge
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