-----I stayed up late last night preparing the speech.--you look so tired today.A. No

问题补充：

-----I stayed up late last night preparing the speech.

----- you look so tired today.

A. No doubt

B. No problem

C. No time

D. No wonder

答案：

A. No doubt

B. No problem

C. No time

(答案→)D. No wonder

解析：考查交际用语。A毫无疑问；B没有问题；C一会公夫；D难怪；句意：—昨天晚上我熬夜准备演讲。—难怪今天你看上去很疲惫。根据句意说明D正确。