Situation: A boy is talking to his mother.
Speaker A: Everybody is going to climb the mountain. Can I go, Mom?
Speaker B: . Wait till you are old enough, dear.
选择一项：
a. Why not?
b. I hope so.
c. I.m afraid not. 解析：此处考察如何拒绝别人。句意∶"——每个人都要去爬山，我能去吗，妈妈?——恐怕不行。亲爱的，等你长大吧。"I.m afraid not.恐怕不行。故选 D。
d. Will you?