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While they _____(discuss) how to prevent accidents,another accident ahappened.填were discuss,为什么?前面有while,为什么不加ing?
题目详情
While they _____(discuss) how to prevent accidents,another accident ahappened.
填were discuss,为什么?前面有while,为什么不加ing?
填were discuss,为什么?前面有while,为什么不加ing?
▼优质解答
答案和解析
应该是WERE DISCUSSING吧,可能答案给错了.
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