单项选择题

There is nothing to do but ______ the experiment.

A. to repeat
B. repeating
C. repeats
D. repeat
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单项选择题
He never laughed, ______ lose his temper.
A. or he ever did
B. nor did he ever
C. or did he ever
D. nor he ever did
单项选择题
In this private school, a dentist ______ the pupils' teeth twice a week.
A. injures
B. instructs
C. inspects
D. informs
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