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.
A．may haveB．may have hadC．must haveD．should have had
B
考查情態(tài)動詞+have done的用法：may have done過去有可能做…,should have done本應該做而沒做，句意是：如果你進入一家商店，覺得職員很無理，停下來想想，她可能過了很困難的一天，設身處地的為她想想。選B。
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