单项选择题

You'd better ______ the paper today, because you need do some correcting work.

A. not to hand in
B. not handing
C. to not hand in
D. not hand in
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Students will continue to make the same mistakes ______ we teachers tell them why they shouldn't do so.
A. unless
B. when
C. if
D. because
单项选择题
-- How about ______ dinner at Roast Duck Restaurant -- Wonderful.
A. to have
B. have
C. having
D. have had
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