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            • 1． 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
              难度：较易
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            • 2．
              Experiment 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
              难度：较易
              解析 收藏 试题篮
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