Because airplans are intended to have long lives,their flight safety must be assured.

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Because airplans are intended to have long lives,their flight safety must be assured.

A.In order to make airplanes have long lives they are often in good condition.
B.To make airplanes have long lives,it is necessary to ensure their flight safety.
C.Because the long lives of airplanes are required,make sure the mechanics do the maintenance task correctiy.
正确答案B
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