单项选择题

The sky was so clear in fact that the communications crew and recovery team could watch the balloon______ to its maximum altitude with the naked eye.

A．hike
B．elevate
C．escalate
D．ascend
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单项选择题
He thought that socialism was the most important cause to which he could______ himself.
A．dedicated
B．catered
C．ascribed
D．clung
单项选择题
Her excitement was ______with a slight feeling of fear.
A．connected
B．matched
C．mingled
D．melted
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