Experiments of this kind ___in both the U.S and Europe well before the Second Wo - 高中英语试题 - 超级试练试题库

题目

题型：不详难度：来源：

Experiments of this kind ___in both the U.S and Europe well before the Second World War.

A．had conducted

B．have conducted

C．have been conducted

D．had been conducted

答案

解析

考查时态。根据句中时间状语before the Second World War可知用过去完成时，且“实验”是被“进行”，故选D。

核心考点

试题【Experiments of this kind ___in both the U.S and Europe well before the Second Wo】；主要考察你对一般现在时等知识点的理解。[详细]

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