单项选择题

The majority of doctors ( )smoking is harmful ( )health.

A、believes/ to
B、believe/ for
C、believes/ for
D、believe/ to
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单项选择题
His uncle used to be a ( ).
A、conduct
B、chemist
C、wait
D、fight
单项选择题
The poor ( )down upon in the old days.
A、were looked
B、was looked
C、was used to look
D、were used to look
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