grandma couldn't keep up with me and i had to stop _______her .A.to wait for B.waiting for C.to waiting D.waited

grandma couldn't keep up with me and i had to stop _______her .
A.to wait for B.waiting for C.to waiting D.waited

答案选 a
stop to do 停下来去做另一件事
stop doing 是停止做原来的事情
stop sb from doing 阻止某人做某事