单项选择题

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
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-- How about ______ dinner at Roast Duck Restaurant -- Wonderful.
A. to have
B. have
C. having
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All is not gold ______ glitters.
A. that
B. in that
C. which
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