Question

请教三道高中英语单选题啦~~麻烦进来看看~~

1.A modern city has been set up___was a wasteland ten years old.
A. what B. which C.that D. where
正确答案是A。请问，为什么B选项不正确？

2.It'll be three weeks___we take our exams.
A.after B.when C. before D. since
请问,C选项为何不正确?

3.who are you going to have___this letter for you?
A. tape B. typed C. been typed D. been typing

请大家回答一下以上三道题.谢谢咯.

Answer 1

第一题绝对是答案错了 what=the thing that 肯定选B 指代"a modern city"
第二题个人认为选C没什么问题
第三题固定用法 have sb do sth

Answer 2

主语从句,从句中做主语
要用过去时
使仪动词,have sb do sth