单项选择题

Please return in an hour. I'll be ready （） then.

A. till
B. by
C. at
D. on

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单项选择题
We have worked out the plan and now we must put it into（）

A. face
B. reality
C. practice
D. deed
单项选择题
In some cases, different approaches to the same scientific problem lead （） conflicting theories.

A. at
B. to
C. of
D. for
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