单项选择题

Great as Russell was, many of his ideas ______ today and are being modified by the work of philoso phers of our time.

A．are to challenge
B．may be challenged
C．have been challenged
D．are challenging
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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
By the end of next month we ______ the review on the research findings.
A．will finish
B．will be finishing
C．will have finished
D．have finished
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