The scientists are （） a series of experiments to learn more about how the body adapts to weightlessness._精华吧

The scientists are （） a series of experiments to learn more about how the body adapts to weightlessness.

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The scientists are （） a series of experiments to learn more about how the body adapts to weightlessness.

A.defining

B.having

C.carrying

D.doing

正确答案：D

Tag：大学英语时间：2022-05-08 23:07:29

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