下面两道题分别是xdf语法教程的26－1和15－16
1. scientists claim that the discovery of the first authenticated mammal bones in amber could provide important clues of determining , in addition to how, when mammals colonized the islands of the West Indies.
C. to determine how mammals colonized the islands of the West Indies and when they did
E. for determining how and when mammals colonized the islands of the West Indies
答案E,我选C
虽然E比C简洁，但感觉for determining 有问题，for＋doing不是不能用来表示目的嘛
2. Gas hydrates, chemical compounds of water and natural gas, are increasingly being studied for their potential to be huge reservoirs of energy, possibly causing sea floor instability, and significant contributors to global warming.
A. to be huge reservoirs of energy, possibly causing sea floor instability, and
B. to be huge reservoirs of energy, possibly causing sea floor instability, and even as
C. as huge reservoirs of energy, possibly causing sea floor instability, and
D. as huge reservoirs of energy, and the possible cause of sea floor instability,
E. as huge reservoirs of energy, as possible cause of sea floor instability, and even as
答案A， 我选E
首先，potential to be是不是固定词组？A是不是表示reservoir和contributors两者并列，两者为什么是并列关系，我对这句话的逻辑关系不是很明白，而且sea floor instability 为什么是因为他是reservoirs of energy导致的
lz的第二题要解决的就是到底是三个并列主体，还是两个并列主体的问题。
平行结构的规则我们都知道，但是在具体的题目中，最模糊的还是确认那几个动词平行还是那几个名词平行的问题。比如我下面两个例子。一起放在这里，欢迎讨论。
GWD-10-Q32:
Most of the purported health benefits of tea comes from antioxidants—compounds also found in beta carotene, vitamin E, and vitamin C that inhibit the formation of plaque along the body’s blood vessels.
A. comes from antioxidants—compounds also found in beta carotene, vitamin E, and vitamin C that
B. comes from antioxidants—compounds that are also found in beta carotene, vitamin E, and vitamin C, and they
C. come from antioxidants—compounds also found in beta carotene, vitamin E, and vitamin C, and
D. come from antioxidants—compounds that are also found in beta carotene, vitamin E, and vitamin C and that
E. come from antioxidants—compounds also found in beta carotene, vitamin E, and vitamin C, and they
Answer: （D）如果不去读懂句子意思，是否可判断inhibit是和are found并列修饰compounds，而不是像C中那样和COME并列修饰benifits.
GWD-9-Q41:
A new study suggests that the conversational pace of everyday life may be so brisk it hampers the ability of some children for distinguishing discrete sounds and words and, the result is, to make sense of speech.
A. it hampers the ability of some children for distinguishing discrete sounds and words and, the result is, to make
B. that it hampers the ability of some children to distinguish discrete sounds and words and, as a result, to make
C. that it hampers the ability of some children to distinguish discrete sounds and words and, the result of this, they are unable to make
D. that it hampers the ability of some children to distinguish discrete sounds and words, and results in not making
E. as to hamper the ability of some children for distinguishing discrete sounds and words, resulting in being unable to make
(B)
我开始做的时候选择的是D，这里面也是几个动词之间的关系，一层一层的。
楼主第一题的问题，我认为这里不是简洁的问题，C中的thay指代不清，因为they优先指代句子主语，就是scientists,指代不清。并且provide for应该是固定搭配。
第2题，我也选错了，选了E.但是A应该是对的，问题在于causing是解释reservoirs of energy，不能跟前面的并列，而potential to是固定用法，这个as应该不能用。我不是nn，谨作参考。
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