Inpreparationforthelaunchingof

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更新 2022-09-03
科目英语
题型单选题
难度中等
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挑错有奖

In _____ preparation for the launching of Shenzhou Ⅶ, scientists need ______ knowledge of weather changes.

A．the; the

B．a; ∕

C．∕; a

D．the; a

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