单项选择题

It was not until an hour later that we heard ______ what had happened.

A．through
B．by
C．about
D．from
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单项选择题
The theory is of great importance ______ the hotter a body is, the more energy it radiates.
A．that
B．when
C．which
D．what
单项选择题
It is highly desirable that a new president ______ for this college.
A．is appointed
B．will be appointed
C．be appointed
D．has been appointed
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