请NN指点大全401

In terms of physics, the characteristic feature of the roller coaster is that the cars' potential energy, gained through their being lifted by a chain drive through the Earth's gravity to the top of the first drop, has been converted to kinetic energy by the time the ride ends.
(A) cars' potential energy, gained through their being lifted by a chain drive
(B) cars' potential energy, a gain achieved as they are lifted by a chain drive
(C) potential energy from the cars' being lifted by a chain drive
(D) potential energy of the cars, gained as a chain drive lifts them
(E) potential energy gained by the cars, being achieved while a chain drive lifts them

答案是E，我的原则是遇到being全部不考虑，可在这里失灵了！而且在E中，being修饰对象不明确。我觉得选A，势能是gained 到的，也在情理之中。

原来如此！多谢多谢！

记得在另外一本书上也见过这题，记不清了，但答案中肯定也带being，差点误人子弟。