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
Henry will not be able to attend the meeting tonight because ______.
A．he must to teach a class
B．he will be teaching a class
C．he will teach a class
D．he will have teaching a class
单项选择题
—Did you see any foreigner present at the party —She was the only foreigner ______ I saw at the party.
A．whom
B．that
C．who
D．which
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