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 Experimentsofthiskind

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問題詳情:

 Experimentsofthiskind

 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

【回答】

D

知識點:過去完成時及其被動式

題型:選擇題

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