单项选择题

Outside my office window there is a fire ______ on the right.

A．escape
B．ladder
C．steps
D．stairs
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单项选择题
Mary doesn't want to get married right away because she thinks that if she ______ husband she probably wouldn't be able to stay with her parents very often.
A．had got
B．could have got
C．has to get
D．were to get
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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