The students _ discussing,the teacher went on _ the

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The students _____ discussing,the teacher went on _____ the passage.
A.finishing --- summarizing B.having finished --- to summarize
C.to finish --- summarizing D.to have finished --- summarizing
该选什么,为什么

选D.
独立主格的用法.主句the teacher went on _____ the passage.因为on所以要选动名词形式.
The students _____ discussing为从句.独立主格结构主要起状语作用,相当于一个状语从句,由名词The students(逻辑主语)+to have finished (逻辑谓语)(根据主句 went on,表示从句已经完成,所以选to have finished ),终上所诉,所以选D.
整句为:The students to have finished discussing,the teacher went on summarizing the passage.

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