单项选择题

Then the speaker ______ the various factors leading to the present economic crisis.

A．dwelt on
B．looked on
C．turned on
D．went on
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The weather forecast says it is going to clear ______ soon.
A．up
B．out
C．over
D．about
单项选择题
Everyone is busy ______ the examination in the classroom.
A．with
B．for
C．on
D．under
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