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【题目】Dingtalk is a tool _______ is mainly used for teachers and students to have online classes during the fight against the novel coronavirus.

A.whichB.whoC.whereD./

【答案】A

【解析】

句意:钉钉是一个工具,主要用于教师和学生在抗击新型冠状病毒期间进行在线课程。

考查定语从句的关系代词。which代指物,作主宾;who代指人,作主语;where哪里,关系副词;根据a tool是先行词,是物,在定语从句作主语,可推测出此处是“which”,故选A

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