单项选择题

With temperature______ so rapidly, we could not go on with the experiment.

A．fell
B．fall
C．falling
D．fallen
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单项选择题
John's mindless______ concealed a warm and kindhearted nature.
A．appearance
B．personality
C．outlook
D．temper
单项选择题
The parents were much kinder to their youngest child than they were to the other,______, of course, made the others jealous.
A．which
B．that
C．what
D．who
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