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
It was presumed that he was dead; then one day he ______ in Italy.
A．turned on
B．turned up
C．turned round
D．turned out
单项选择题
It will take months for his fractured leg to ______.
A．heal
B．recover
C．cure
D．recuperate
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