天山真题-5

5. 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,
E) A recently discovered substance, 50 times sweeter than sucrose from the licorice plant,
答案是B，不是很理解。

b中的语法结构应怎样分析呢？如from the licorice plant， 50 times sweeter than sucrose,
是并列成分修饰a substance 的话，中间不应该有连词吗？  50 times sweeter than sucrose,
为什么不可以看成是修饰 the licorice plant？

请指教