单项选择题

I’ve worked here since I ______ Harvard Business School.

A．leave
B．left
C．have left
D．had left
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单项选择题
Without the help of people from every corner of the world, people in Wenchuan County, Sichuan Province ______ recovered very quickly from the May Twelfth Earthquake.
A．must not have
B．couldn’t have
C．may not have
D．can’t have
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