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How did the robot behave at the beginning of the test？
A. It rotated its wings through 90 degrees
B. It twitched（骤然一抽）but gradually gained height
C. It was twitched and broke down
D. It landed not 10ng after the test
A．which B．where C．why D．that
A. which
B. where
C. why
D. that
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