26、The experiment _____they had made a great contribution succeeded at last.

A. at which       B. to which       C. on which        D. to that

26、B

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The experiment _____they had made a great contribution succeeded at last.

A. at which       B. to which       C. on which        D. to that

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科目：高中英語 來源： 題型：

The experiment _____they had made a great contribution succeeded at last.

A. at which       B. to which       C. on which        D. to that

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