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
Great as Russell was, many of his ideas ______ today and are being modified by the work of philosophers of our time.
A．are to challenge
B．may be challenged
C．have been challenged
D．ale challenging
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
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