单项选择题

______ retire are still able to receive pension that they have paid into the social security system during their working days.

A．Most people
B．since most people
C． Most people are
D． Most people who
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单项选择题
. _______ his arms over his head, Lincoln declared he was the “big buck of the lick.”
A． Wave
B．Waving
C．Waved
D．Been waved
单项选择题
Man uses the energy for everything from flying to the moon to ______ about it.
A． think
B．thought
C．thinking
D．will think
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