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
No matter how hard he worked, ______. ( )
A．he could not do any better
B．and he could not do any better
C．so he could not do any better
D．but he could not do any better
单项选择题
The story ______ many years ago. ( )
A．take place
B．took the place
C．took place
D．happen
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