When the students came into the classroom, the teacher______on the blackboard.

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问题 When the students came into the classroom, the teacher______on the blackboard.

选项 A、was writing
B、is writing
C、wrote

答案A

解析 考查时态。由句意不难看出,此处强调的是主从句动作同时进行,指“学生们进教室的时候,老师正在黑板上写着”。由于从句用的是一般过去时态.所以主句用过去进行时。
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