单项选择题

If the experiment succeeds or fails, it will provide us with valuable experience which is essential to improving our future work.

A. If
B. provide us
C. experience
D. improving
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No one except Tom and Mary () late for the class.

A. are
B. is
C. were
D. was
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Only 11 people ()the shipwreck.

A. survived after
B. survived through
C. were survived
D. survived
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