—I had been working till 4∶00 a．m. to prepare a report for my boss.
— you look very tired.
A. No doubt
B. No hurry
C. No wonder
D. No need
网友回答
A. No doubt
B. No hurry
(答案→)C. No wonder
D. No need
解析：考查交际用语。A不怀疑；B不忙；C不奇怪；D不需要。句意：——为了为老板准备报告，我一直工作到早上4点。——难怪你看起来很累。