单选题 Woman: I don't think we should have told Allen about the surprise party for Sue.
Man: It's all right. He doesn't make promises lightly, and he promised not to tell.
Question: What does the man mean?

【正确答案】 D
【答案解析】[解析] 对话中男士说Alien不轻易许诺,他许诺说不会告诉Sue,所以D是正确答案。