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the red switch on the left and the flying machine will swiftly go up into the ai

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the red switch on the left and the flying machine will swiftly go up into the ai

     the red switch on the left and the flying machine will swiftly go up into the air and      its journey.

A.Press, begins

B.Press, begin

C.Pressed, begins

D.To press, to begin

试题答案

B

解析:

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