单项选择题

She did her work ______ her manager had instructed.

A．as
B．until
C．when
D．though
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单项选择题
I only know the man by ______ but I have never spoken to him.
A．chance
B．heart
C．sight
D．experience
单项选择题
Although he has become rich, he is still very ______ of his money.
A．economic
B．thrifty
C．frugal
D．careful
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