单项选择题

The new constitution will take ______ from the beginning of July.

A．effect
B．position
C．place
D．post
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单项选择题
America is waging a war against terrorism ______ a large scale.
A．at
B．to
C．with
D．on
单项选择题
He quickened and ______ his walking pace as he heard the announcement in the loudspeakers that the train would leave in ten minutes.
A．prolonged
B．lengthened
C．extended
D．stretched
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