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Experiments of this kind ___in both the U.S and Europe well before the Second World War.
A．had conductedB．have conductedC．have been conductedD．had been conducted
D
考查時(shí)態(tài)。根據(jù)句中時(shí)間狀語(yǔ)before the Second World War可知用過(guò)去完成時(shí)，且“實(shí)驗(yàn)”是被“進(jìn)行”，故選D。
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