单选题 A: May I play my computer game for an hour?
B: ______.
A. You should study harder.
B. I've said before that the game takes too long.
C. Yes, you get it.
D. Sorry, your mother's using the computer now.

【正确答案】 D
【答案解析】[解析] 说话人A提出一个要求，说话人B没有答应，并给出一个理由。对一个要求的应对可以是同意(Of Course，Certainly)，或者不同意(Sorry)。