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
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单项选择题
There is nothing to do but ______ the experiment.
A. to repeat
B. repeating
C. repeats
D. repeat
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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