单项选择题

The small shop owner often welcome nearby competition to ______ business.

A．specify
B．stretch
C．stimulate
D．survive
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单项选择题
He is quite worn out from years of hard work. He is not the man ______ he was 20 years ago.
A．which
B．that
C．who
D．whom
单项选择题
Shares on the stock market have ______ as a result of a worldwide economic downturn.
A．turned
B．changed
C．floated
D．fluctuated
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