og48——对ETS解释的疑问

48. The golden crab of the Gulf of Mexico has not been fished commercially in great numbers, primarily on account of living at great depths-- 2,500 to 3,000 feet down.
(A) on account of living
(B) on account of their living
(C) because it lives
(D) because of living
(E) being they live

OG explanation: As used in choices A, B, and D, the phrases on account of and because of are unidiomatic;because, which appears in C and E, is preferable here since because can introduce a complete subordinate clause explaining the reson why the golden crab has not been fished extensively.....Choice D, like A, fail to provide a noun or pronoun to perform the action of living, but even with its the phrease would e more awkward and less clear than it lives

问题1：why on account of and because of are unidiomatic

问题2：D和A中，living 的主语不可以直接看作主句主语么？谢谢

on account of  和 because of 都是介词, 介词必须跟名词. D和A中的living是分词, 而不是名词, 所以on account of living或者because of living

是错的.

living这个词单独用不一定就代表名次词性. 比如: Living at the top of the mountain, I enjoy the view very much.    此处Living表达的是一个动作. 如果前面加一个its,  its living就变成一个名次性短语.  但即便这样og也解释说不如 because it lives来的好.

on account of its living ...是否可以

尽管，从表达上来看，用because it lives。。。是最清楚的。但，我还是想搞清楚on account  of its living。。。是否可行。至少在语法上

对版主的这句话不是很理解， 介词好像也可以接doing 的吧，比如OG19：

19.   In addition to having more protein than wheat does, the protein in rice is higher quality than that in wheat, with more of the amino acids essential to the human diet.

(A) the protein in rice is higher quality than that in

(B) rice has protein of higher quality than that in

(C) the protein in rice is higher in quality than it is in

(D) rice protein is higher in quality than it is in（B）

(E) rice has a protein higher in quality than

薰衣紫草的意思是: 加名词结构.

in addition to后面的加的是由having引导的名词结构, 不要割裂开来看.

同意 in addition to(介词) + Ving 和本题动词名词化的情形不同

living ....从意义上讲是一个分词短语,表示因为.再加上一个 because of 纯属wordy.也是原因之一吧.