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: 考查動詞時態(tài)。根據(jù)before the Second World War可知此處是指過去的過去，應該用過去完成時；而experiment和conduct是被動關系，所以用過去完成時的被動形式,故答案選D。句意：二戰(zhàn)前就在美國和歐洲進行過這種實驗。
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