the students were writing busily when miss Brown went to get a book she ___ in the office.这句中填had left,为什么不是left呢?

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the students were writing busily when miss Brown went to get a book she ___ in the office.这句中填had left,为什么不是left呢?
the students were writing busily when miss Brown went to get a book she ___ in the office.
这句中填had left,为什么不是left呢?

the students were writing busily when miss Brown went to get a book she ___ in the office.这句中填had left,为什么不是left呢?
went 已经是过去时态了 过去的过去用过去完成时 所以填had left

这本书是在她去找之前落在办公室的，去办公室这个动作用的是went，所以这里是过去的过去，也就是过去完成时，had left.

went 是过去时态 。她留下一本书在办公室里 应该是在went to ger a book 之前。
所以在过去时态之前。 所以用过去完成时。
即 had left.

went 是过去时态 。她留下一本书在办公室里 应该是在went to ger a book 之前。

The students were very h_____ . The students were fast (sleep). Who were the students with today There were many students inThere were many students in the classroom(改为单数句) The students were listening to the teacher attetively是什么意思 The audience,（）,enyoyed the performancemost of them were studentmost of whom were studentsthey were mostly studentsthey thenselves were students 在轧钢机械中 The WR All the students were here yesterday.的同义句 all the students were very excited改一般疑问句快 All the students were very excited 怎么肯定否定回答 All the students were very happy怎么改否定句 all the students were very sxcited的肯/否 all the students were very sxcited的否定句 the students were all ( ) home.选in还是at Were there any students on the playground作否定答语 All the students were bored at this filmwere bored There were many students in the libThere were many students in the library last week（改为一般疑问句） The teacher said that they were hard working students.那空为什么填were?