问题
选择题
The lady ________ have done something wrong, because she is looking guilty.
A．would
B．should
C．can
D．must
答案
答案：D
题目分析： 句意：这个女士一定做了错事，因为她看起来很内疚。表示肯定推测用“must have done”，would have done“本来会做”，can have done“本可以做却没有做”，should have done过去本应该做却没有，所以选D。