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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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
单项选择题
The concerto was performed by a violinist of unquestioned ______ but limited imagination.
A．capacity
B．faculty
C．competence
D．aptitude
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