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．have been challenged
C．may be challenged
D．are challenging

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单项选择题
（）nothing more to discuss, the CEO got to his feet, said goodbye and left the meeting room.

A．There was
B．Being
C．There being
D．As there being
单项选择题
It seems oil（）from this pipe for some time. We'll have to take machine apart to put it right.

A．had leaked
B．is leaking
C．leaked
D．has been leaking
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