一道很恶心的语法题。。

52074653UID: 2118284

Many students of United States history do not realize that, at one time, individual states did not have to abide by certain amendments to the Constitution, but they have since been applied at the state level.

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$ x& w+ B7 r$ g' k# G' N$ ?A 原句
5 u+ h. d4 n; Y4 H8 tB Constitution, but they are now applied at the state level
C Constitution, and have since been applied at the state level
6 e2 j; I* P5 _D Constitution that now apply at the state level
) U2 n# g0 |. ME Constitution , since becoming applied at the state level
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" o, D6 d" d9 W: h% ~5 _3 o答案是D。。:L:L为什么？顺便讲下意思，谢谢

sam881030UID: 2244146

简单主从并

52074653UID: 2118284

.....句子是什么意思
applied at the state level 是什么东西APPLY？。。

water0915UID: 2222422

certain amendments
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我选的也是D