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