单项选择题

The thought ______ he might be a scientist some day encouraged him to study hard.

A．whether
B．that
C．how
D．why
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单项选择题
We should ______ attention ______ spelling.
A．pay... on
B．pay... for
C．pay... of
D．pay... to
单项选择题
Something bad has happened ______ the family last night.
A．to
B．for
C．of
D．toward
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