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题型:单选题 题类:常考题 难易度:普通

天津市静海县第一中学、杨村一中、宝坻一中等六校2017-2018学年高一上学期英语期中联考试卷

The students usually do scientific experiments with the teacher _____ beside to help them.
A、were standing B、stood C、standing D、to stand
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