单项选择题

Many years had __________ before they returned to their original urban areas.

A．floated
B．elapsed
C．skipped
D．proceeded
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单项选择题
All the people in the stadium cheered up when they saw hundreds of colorful balloons __________ slowly into the sky.
A．ascending
B．elevating
C．escalating
D．lingering
单项选择题
We shall probably never be able to __________ the exact nature of these sub-atomic particles.
A．assert
B．impart
C．ascertain
D．notify
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