单项选择题

The boys mustn’t play with fire, ______

A. may they
B. must they
C. do they
D. need they
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单项选择题
—When will you be through with your work, Jones —______ My boss usually finds something for me to do at the last minute.
A. Who knows
B. Would you help me
C. I beg your pardon
D. Anything the matter
单项选择题
The results of the study indicated that it was the type of fat ______ made the difference.
A. as
B. what
C. who
D. that
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