问题补充：
---Excuse me , would you please speak a little more ?
---Sorry, I thought you could follow me.
A. sadly
B. quickly
C. slowly
D. politely
答案：
A. sadly
B. quickly
(答案→)C. slowly
D. politely
解析：句意：对不起，请你说的再慢一点好吗？不好意思，我以为你能跟上。都是副词：A. sadly难过地；B.quickly快地； C.slowly慢慢地；D. politely有礼貌地。结合语境可知选C。
