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It served Susan right. She_________have thought twice before posting her photos on her Blog.
A、 should
B、 may
C、 could
D、 would
【正确答案】：A
【题目解析】：此题考查的是情态动词的用法。此句的意思是她在她微博上发照片之前本应三思而行。 Should have done中should加现在完成时表示本应做某事（却未做）。