—I had been working till 4∶00 am. to prepare a report for my boss.—you look very tired.A.

问题补充：

—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

答案：

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。