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．ofB．byC．forD．on
A．of
B．by
C．for
D．on
单项选择题
Because of the unexpected changes, they postponed ______us an answer.
A．giving
B．have given
C．to give
D．to have given
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