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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