Experimentsofthiskindinboththe

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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

Experiments of this kind _______ in both the U.S. and Europe well before the Second World War.（2011北京卷21）

A．have conducted

B．have been conducted

C．had conducted

D．had been conducted

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