单项选择题

I felt somewhat disappointed and was about to leave, ______ something occurred which attracted my attention.

A．unless
B．until
C．when
D．while
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单项选择题
He would try to ingratiate himself ______ his clients in order to earn more money.
A．into
B．with
C．for
D．from
单项选择题
Although he made a big fortune in the lottery, he is still very ______ of his money.
A．economic
B．thrifty
C．frugal
D．careful
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