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
. Mr. Green requires that the students ______ cheat in any exam.
#88188
A
should
B
don’t
C
wouldn’t
D
not
 It was playing computer games that cost the boy plenty of time he ____ doing his lessons.
#89110
A
might have spent
B
ought to have spent
C
must have spent
D
could have spent