单项选择题

The dean of our department is supposed ______ for Florence the day before yesterday.

A．to leave
B．to have left
C．to be leaving
D．to have been left
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单项选择题
______ there is little we can do to change the reality, we can not be totally at the mercy of the harsh environment.
A．Since
B．When
C．Unless
D．While
单项选择题
______ any film before, his first attempt was a great success.
A．Though having never directed
B．Despite he had never directed
C．As he had never directed
D．In spite of his never having directed
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