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
I have kept that picture ______ I can see it clearly, as it always reminds me of my university days.
A. which
B. where
C. whether
D. when
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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