单项选择题

Pneumonia has been a（）disease.

A.ordinary
B.commonly
C.simple
D.common

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单项选择题
We thought it foolish （）you to do it.

A.for
B.at
C.with
D.in
单项选择题
Attendance at my lectures has （）considerably since my course was changed to an elective one.

A.fallen off
B.fallen over
C.fallen down
D.fallen on
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