Scientificexperiments______bystudent

发布时间：2020-07-25 21:13:07

Scientific experiments ______ by students without the teachers’ instructions can be dangerous.A.carry outB.carrying outC.carried outD.carrying

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C解析考查非谓语动词experiments与carry out为动宾关系要用过去分词作定语。句意：学生没有老师指导做科学实验有可能有危险。
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