问到英语语法问题.7.The students _____ discussing,the teacher went on

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问到英语语法问题.
7.The students _____ discussing,the teacher went on _____ the passage.
(选A,为什么不是选D)
A.finish --- summarizing B.having finished --- to summarize
C.to finish --- summarizing D.to have finished --- summarizing
可参考答案就是A.

选B ,不选A .意思是,学生们讨论完之后,老师接着总结段落.老师总结段落这件事和学生讨论是两件不同的事要用go on to do ,由于题中没出现连词,所以the teacher.之前那个肯定不能是句子.怎么就不是句子了?那就得把动词变成非谓语having finished 表示发生在went on之前.答案A明显不对 .相信我,绝对没错

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