【題目】Experience of this kind in both the U.S. and Europe well before the Second World War.
A.have conducted
B.have been conducted
C.had conducted
D.had been conducted

【答案】D
【解析】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)，由于experiments與conduct為被動(dòng)，故選D。

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