问题补充：
—Mom，may I play computer games just for a while?
—！Dad is writing his paper.
A. How dare you
B. Its up to you
C. Behave yourself
D. Go ahead
答案：
A. How dare you
B. Its up to you
(答案→)C. Behave yourself
D. Go ahead
解析：考查交际用语。A你怎胆敢！B由你决定；C行为规矩些；D去做吧！句意：—妈妈，我可以玩一会电脑游戏吗？—规矩一点，爸爸正在写论文。故C正确。
