--- Haven’t you checked the bill? does $53 plus $5 service charge e to $68?
--- Oh! I’m sorry, sir. Here is the change for you.
A. Ever since
B. Even though
C. Since when
D. As though
网友回答
A. Ever since
B. Even though
(答案→)C. Since when
D. As though
解析：考查状语从句的连接词。“你还没检查账单吗？”“从什么时候开始53加5等于68了？”“噢！对不起，先生。这是找你的零钱。”A“自从”；B“即使”；C“从什么时候”；D“似乎”。故选C。