---Don't skate on the lake! ---Why not? Isn't it thick enough___________?
#48601
A
to skate
B
skating on
C
skating
D
to skate on
推荐题目
---I am sorry to have kept you ___________.---It doesn't matter. I've just come.
#49688
A
wait
B
waited
C
waiting
D
to wait
