单项选择题

There is a real possibility that these animals could be frightened, ______ a Sudden loud noise.

A．being there
B．there having been
C．there was
D．should there be
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What will continue to be ______ it is today--next in importance to oxygen
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B．which
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By the year 2010, scientists probably ______ an effective treatment for cancer.
A．will have discovered
B．are discovering
C．will be discovering
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