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。