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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单项选择题
A power failure created ______ in transportation.
A．enclosure
B．emergency
C．extension
D．excitement
单项选择题
A．presentB．offerC．withD．extend
A．present
B．offer
C．with
D．extend
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