After the summer vacation, the professor, together with his fellow teachers, ______ the scientific experimentA.goes downB.go downC.gets down toD.get down to
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C解析考查主谓一致。together with连接两个主语时，谓语动词取决于前者，get down to 开始认真做某事。句意：暑假之后，这位教授和他的同伴老师们开始专心于科学实验。故选C。