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
______ was to return to school.
A. That really interested him

B. What really interested him
C. Which really interested him

D. That interested him really
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