单项选择题

If this can't be settled reasonably, it may be necessary to ______ to force.

A．resolve
B．restore
C．respond
D．resort
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单项选择题
He stood on the balcony, waving to the plane, which ______ into the cloud.
A．vanished
B．disappeared
C．lost
D．dimmed
单项选择题
Branches ______ gently in the wind, which forms a beautiful scene.
A．swing
B．drag
C．regulate
D．switch
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