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2道独立主格题目解疑The report_____,a lively discussion about it soon

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2道独立主格题目解疑
The report_____,a lively discussion about it soon began in our school
A,having read B,having been read
C,was read D,reading
为什么选择B,独立主格不是没B那种形式的吗?
He is making a model plane,some old parts____
A,help B,helped
C,is helping C,has helped
选择什么为什么?答案上选择A,
2道独立主格题目解疑The report_____,a lively discussion about it soon
1:The report_____,a lively discussion about it soon began in our school.
你可以这样去理解
With the report having been read,a lively discussion about it soon began in our school.
C首先就pass了!这里用having been read表示被动,因为先行词是report,"报告"被...看,而不是"报告"去看...,所以排除A和D!
2:一看题目就把C和D给KO了!
He is making a model plane,some old parts____
借助于那些旧零件的帮助,他正在制作飞机模型.
由于是old parts和help之间是主动关系,所以只能选择:help!