单项选择题

You can（）a refund if the product is damaged.

A.ask to
B.ask about
C.ask
D.ask for

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单项选择题
If you _______ hard enough, you _______ the exam.
A.study,
B.have
C.are
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单项选择题
Hurry up, _______ you will be late for work.
A.or
B.so
C.and
D.but
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