Duringthechemicalexperiment,hetold

发布时间：2020-07-27 15:32:57

During the chemical experiment, he told his students to ________ what had happened to the materials．A.searchB.find outC.look forD.see

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B解析search, look for, see(看见)的宾语是具体的事物，而what had happened to the materials是一种状况。
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