Experiments of this kind ___in both the U.S and Europe well before the Second Wo
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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 |
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答案
D |
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。 |
举一反三
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