56。 Unlike crestedwheatgrass, an alien species from Siberia that forms only shallow roots andproduces tall above-ground shoots, native North American grasses develop anextensive root system, allowing for greater enrichment of the soil, but donot grow to be very tall.
(A) native North American grasses developan extensive root system, allowing for greater enrichment of the soil, but donot grow to be very
(B) native North American grasses developan extensive root system, which allows for their greater enrichment of thesoil, but without growing to be that
(C) the root system of native NorthAmerican grasses is extensive, allowing for greater enrichment of the soil, butthey do not grow to be very
(D)the root system of native North American grasses is more extensive, allowingfor the greater enrichment of the soil, but these grasses do not grow to bevery
(E)the extensiveness of the root system of native North American grasses allowsfor their greater enrichment of the soil, but they do not grow to be that
想问下逗号后的现在分词除了可以(1)修饰前面的整句话,表示前面的动作产生的结果;(2)修饰逗号前面的先行词(包括名词和名词性词组),不知道是不是还可以修饰逗号前面的句子的主词呢?
另外,如果逗号前面的句子末尾是N.+介词短语,那这个现在分词是修饰N呢还是可以修饰介词短语中的名词呢?
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