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
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单项选择题
Mother has ______ to give her a watch on her 20th birthday.
A．asked
B．promised
C．allowed
D．advised
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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
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