-----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：There is no doubtthat…不容怀疑；No problem没问题；No time没时间；It is no wonder that ….难怪，它的省略的形式是No wonder+句子。句意：--我昨天晚上熬夜准备演讲稿了。--难怪你今天看起来那么累。