单选题 ______ you call me to say you're not coming, I'll see you at the theatre.

【正确答案】 D
【答案解析】though引导让步状语从句，whether不能引导状语从句，until引导时间状语从句，unless = if..not引导条件状语从句．根据I'll see you at the theatre，答案为D。