单项选择题

I must work hard, however I'll fail in the exam.

A. must
B. hard
C. however
D. in
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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
单项选择题
No one except Tom and Mary () late for the class.

A. are
B. is
C. were
D. was
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