If you go into a store and feel that the clerk is being rude, stop and think that she____ a tough day, and put yourself in her shoes. 
#88069
A
may have
B
may have had
C
must have
D
should have had
推荐题目
If I ______ten years younger, I _____ very happy.
#86935
A
am, would be
B
am, shall be
C
were, shall be
D
were, would be
You are late. If you ____ a few minutes earlier, you ____ him. 
#86905
A
came; would meet
B
had come; would have met
C
come; will meet
D
had come; would met
 ——Yesterday, I didn’t see Ben at the party.   —— You _____ him. We just came back from Beijing this morning. 
#87561
A
mustn’t have seen
B
needn’t have seen
C
couldn’t see
D
can’t have seen