作业帮 > 英语 > 作业

All the letters ___,John took them to the post office.

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/31 15:35:50
All the letters ___,John took them to the post office.
A.had been writing B.having been written C.wrote D.had written选什么为啥
B
All the letters 【having been written 】(独立主格结构),John took them to the post office.
All the letters having been written 是独立主格结构做时间状语的
等于When all the letters had been written,
题干因为没有连词,只能用独立主格结构了,前一部分不能选用A,C,D等谓语动词