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
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单项选择题
By the end of this semester, we surely ______a satisfactory solution to the problem.
A. have found
B. will find
C. will have found
D. are finding
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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