Experiments of this kind ___in both the U．S and Europe well before the Second World War．
A．had conductedB．have conducted
C．have been conductedD． had been conducted
D

試題分析: 考查動(dòng)詞時(shí)態(tài)。根據(jù)before the Second World War可知此處是指過去的過去，應(yīng)該用過去完成時(shí)；而experiment和conduct是被動(dòng)關(guān)系，所以用過去完成時(shí)的被動(dòng)形式,故答案選D。句意：二戰(zhàn)前就在美國和歐洲進(jìn)行過這種實(shí)驗(yàn)。
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