选择题 All of them wondered when-------- A. they can set off B. can they set off C.to set off

分类: 作业答案 • 2021-12-31 10:30:33

问题描述：

选择题 All of them wondered when-------- A. they can set off B. can they set off C.to set off
答案给的是C，when to set off。谁能给我解释一下

答

C
如果选A,可以改为 they could set off
因为主句的动词是过去式wondered ,从句时态要与之保持一致.能解释一下这是什么考点吗？