A lot of tests ________ on a large number of rats in the past twoyears.
A.have been carried outB.were carried outC.have been carried onD.were carried on在线课程A
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A lot of tests on a large number of rats in the past twoyears.A.have been carried outB.were carried
编辑：chaxungu时间：2026-04-24 13:01:09分类：高中英语题库
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