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
Do earthquakes ______ often in North America
A．break
B．break out
C．happen to
D．occur
单项选择题
It looks ______ the family has got a lot of problems.
A．as long as
B．as if
C．while
D．though
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