单项选择题

_________, many laws of nature actually exist.

A．Having not discovered
B．Not having discovered
C．Having not been discovered
D．Not having been discovered
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单项选择题
_________did Jerome accept the job.
A．Because it was interesting work
B．The work was interesting
C．Only because it was interesting work
D．Only because it was interested work
单项选择题
A book may be compared to the company you keep; if it be good, you cannot keep it _________ long; if bad, you cannot get rid of it _________ early.
A．very, very
B．too, so
C．too, too
D．such, so
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