单选题 With out the help of people from every corner of the country, people in Wenchuan County, ______ recovered very quickly from the May Twelfth Earthquake.

A、 must not have
B、 couldn't have
C、 may not have
D、 can't have

【正确答案】 B

【答案解析】 本题考查虚拟语气。题干的意思是“如果没有全国人民的援助，汶川的人们不可能很快从5.12大地震中恢复过来”，couldn't have done意思是“不可能做某事”。