SAT语法题P44The shift from traditional to cosmetic dentistry is

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SAT语法题P44
The shift from traditional to cosmetic dentistry is because adults are getting fewer cavities adn becoming more vain.
A.is because adults are getting fewer cavities and becoming
B.is because of adults getting fewer cavities and their becoming
C.is caused from adults getting fewer cavities and in addition become
D.is occuring because adults are getting fewer cavities and becoming
E.occurs because of adults are getting fewer cavities and become
为什么?我选了A

这应该是语法方面的问题.because 要做表语只有在主语是this或that 的情况下才行.这句如果选A的话,就是 The shift..is because...这这种结构了.而D.是个原因状语从句,说明这种shift is occurring 的原因.其他三个也是语法结构的问题.

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