单项选择题

We should ______ attention ______ spelling.

A．pay... on
B．pay... for
C．pay... of
D．pay... to
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单项选择题
Something bad has happened ______ the family last night.
A．to
B．for
C．of
D．toward
单项选择题
The secretary worked late into the night, ______ a long speech for the president.
A．to prepare
B．preparing
C．prepared
D．was preparing
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