前缘襟翼与缝翼各有几个位置?

前缘襟翼与缝翼各有几个位置?

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—Why not ______ boating with us in the park?A to go B going C go D goes

—Why not ______ boating with us in the park?A to go B going C go D goes

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—When the lights turn red, the traffic ______ stop.

—When the lights turn red, the traffic ______ stop.

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—We'll go for a picnic if it ______tomorrow.

—We'll go for a picnic if it ______tomorrow.

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—Never get off the bus______it has stopped.A if B as soon as C until D or

—Never get off the bus______it has stopped.A if B as soon as C until D or

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