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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单项选择题
A new technique（）, the gross output increased by 20 percent.

A．working out
B．having worked out
C．having been worked out
D．to have been worked out
单项选择题
Please take what you like, you（）eat too much.

A．may not
B．would not
C．must not
D．can not
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