单项选择题

This terrible accident happened（）the cold evening of Oct. 5,1989.

A．in
B．to
C．at
D．on

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单项选择题
Great as Newton was, many of his ideas today and are being modified by the work of scientists of our time（）

A．are to challenge
B．may be challenged
C．have been challenged
D．are challenging
单项选择题
The conference（）a full week by the time it ends.

A．must have lasted
B．will have lasted
C．would last
D．has lasted
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