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
I couldn't understand why he pretended ______ in the bookstore.
A．to see me not
B．not to see me
C．not see me
D．to see not me
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