40. In 1995 Richard Staliman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics.
(A) laws, an observation about electric current first made in 1845 and
(B) laws, which was an observation about electric current first made in 1845 and it is
(C) laws, namely, it was an observation about electric current first made in 1845 and
(D) laws, an observation about electric current first made in 1845, it is
(E) laws that was an observation about electric current, first made in 1845, and is
A似乎是比较简洁。可是划线部分后面有now，难道不应该换个时态嘛？
E就分辨出不同时态了。
请教一下OG11th的官方解释是怎么说得。谢谢！
同意选A.
LZ有没有答案?
40. In 1995 Richard Staliman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics.
(A) laws, an observation about electric current first made in 1845 and
(B) laws, which was an observation about electric current first made in 1845 and it is
(C) laws, namely, it was an observation about electric current first made in 1845 and
(D) laws, an observation about electric current first made in 1845, it is
(E) laws that was an observation about electric current, first made in 1845, and is
A似乎是比较简洁。可是划线部分后面有now，难道不应该换个时态嘛？
E就分辨出不同时态了。
请教一下OG11th的官方解释是怎么说得。谢谢！
A. Correct. In this sentence, the noun phrase in apposition properly identifies and explains the law, using parallel structure and concise expression.
B. it is violates the parallelism of first made and now included.
我觉得这里made和included是表示被动的修饰。
A中如果加上is，就是多了谓语动词，变成一个句子了，个么结构就有问题了。
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