26. It is difficult to do some of the experiments in our physics textbooks.A. to describe

发布时间：2020-08-16 06:51:06


26. It is difficult to do some of the experiments      in our physics textbooks.
A. to describe
B. describing
C. described
D. being described

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A. to describe
B. describing
(答案→)C. described
D. being described
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