单项选择题

（）is often the case, one third of the workers have over-fulfilled the production plan.

A．What
B．This
C．That
D．As

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单项选择题
This terrible accident happened（）the cold evening of Oct. 5,1989.

A．in
B．to
C．at
D．on
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
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