Dingtalk is a tool _______ is mainly used for teachers and students to have online classes during th...
2022-06-08 21:13:03 113次 2020年甘肃省酒泉市九年级教学检测英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Dingtalk is a tool _______ is mainly used for teachers and students to have online classes during the fight against the novel coronavirus.
A.which B.who C.where D./
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