单项选择题

______ had I closed the door ______ somebody started knocking at it.

A．As soon as, then
B．Although, yet
C．No sooner, than
D．If, then
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______ is well known, the key to success lies in hard work.
A．As
B．That
C．Which
D．What
单项选择题
He is very ______ in using money.
A．economic
B．economical
C．economy
D．economize
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