题目

-how many trees do you think____ last spring
-About 1000.They did a very good job.
A.were planted B.did they plant
为什么是A
b为什么不行?
不是有They did a very good job
怎么样用b 这个句式是什么
how many apples do they need？这个do they need为什么行？did they plant 怎么不行？
与do you think有关？

提问时间：2021-01-16

答案

原句应该为：
I think (that)... trees were planted last spring.
I think (that)they planted.trees last spring.
就名词前的数量提问用how many；
do you think已经用了疑问句的形式,所以其后的从句不用再写成疑问语序,只要把疑问词提前即可,若想用主动形式答案B应改为they planted.
A,树是在过去被种,所以用过去被动式.
如果用B的话,应该改为：how many trees do you think they planted last spring.