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
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
We congratulate you ______ the success you have got.
A．by
B．for
C．on
D．with
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