All I could do is to send him to school. A.which B.what C.that D.the thing

分类: 作业答案 • 2022-02-28 22:15:22

问题描述：

答

C that.这是一个定语从句：All I could do is that to send him to school.其中,All是这个定语从句的先行词.在定语从句中如果先行词是All的话,关系代词就必须用that.