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
Is this the ______ that you are late again ( )
A．season
B．cause
C．reason
D．excuse
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