Experiments of this kind in both the U.S.

likewindy2022-10-04 11:39:541条回答

Experiments 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

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D

本题考查时态。根据句中时间状语before the Second World War可知用过去完成时,由于experiments与conduct为被动,故选D。
1年前

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