15. A substance from the licorice plant, 50 times sweeter than sucrose, was recently discovered, is not only a natural sweetener but also prevents tooth decay.
(A) A substance from the licorice plant, 50 times sweeter than sucrose, was recently discovered
(B) A substance, which was recently discovered, from the licorice plant, 50 times sweeter than sucrose,
(C) A substance from the licorice plant, which was recently discovered to be 50 times sweeter than sucrose,
(D) A substance from the licorice plant, 50 times sweeter than sucrose , which was recently discovered,（B）
(E) A recently discovered substance, 50 times sweeter than sucrose from the licorice plant,
請問這一題b和d要如何分辨?
984. There is ample evidence, derived from the lore of traditional folk medicine, that naturally occurring antibiotics are usually able to be modified to make them a more effective drug.
(A) are usually able to be modified to make them a more effective drug
(B) are usually able to be modified to make them more effective drugs
(C) are usually able to be modified, which makes them more effective drug
(D) can usually be modified to make them a more effective drug（E）
(E) can usually be modified to make them more effective drugs
請問這一題為什麼不是b呢?可以翻b作"經常能夠"e"能夠經常"嗎?兩者有何不同?
969. Leaching, the recovery of copper from the drainage water of mines, as a method of the extraction of minerals, it was well established as early as the eighteenth century, but until about 25 years ago miners did not realize that bacteria taken an active part in the process.
(A) as a method of the extraction of minerals, it was well established
(B) as a method of the extraction of minerals well established
(C) was a well-established method of mineral extraction
(D) was a well-established method of extracting mineral that was（C）
(E) had been a method of mineral extraction, well established
答案是c沒問題,我好奇的是c後面沒畫線的地方"was a well-established method of mineral extraction as early as the eighteenth century"以as... as為界前後要怎麼比呢?early如果是修飾前半句,是不是應該用"in the eighteenth century"才對呢?
个人理解：
15通过which来区分，非限性which通常指代，前名词。
984，be able to be done这种表达错，应can be done
969, 意思上可能不同，as early as the eighteenth century早在18世纪（可能19世纪也是)，in the eighteenth century没有（可能19世纪也是)这层意思。
關於969我的意思沒有表達清楚,我的意思是,有沒有可能為"as early as in the eighteenth century" 因為如果光是"as early as the eighteenth century",那the eighteenth century是跟本句中哪個時間作比較呢?
可以幫我再作一點解釋嗎?謝謝
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