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

—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

A. No doubtB. No hurry(答案→)C. No wonderD. 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。

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