题目内容
___ the guide was introducing Chinese ancient coins in the museum, the students were taking notes.
A. While B. If C. After D. Before
A 【解析】句意:当导游在博物馆里介绍中国古币时,学生们在做笔记。考查连词辨析题。A. While当……时候,表示主句和从句动作同时发生;B. If如果,表条件;C. After在……以后;D. Before在……以前。本句是时间状语从句,主句和从句动作同时发生,可排除BCD。根据句意语境,可知选A。
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