(2013·江苏苏中三市一模)—I'm afraid it's going to rain this afternoon.
— Look at the dark and cloudy sky.
A. Not really
B. Is it?
C. Why not?
D. I guess so.
网友回答
A. Not really.
B. Is it?
C. Why not?
(答案→)D. I guess so.
解析：选D 考查交际用语。句意：“恐怕今天下午要下雨。”“我想是的。你看天空乌云密布。”根据语境可知，应选I guess so “我想是的”。