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本題可平衡對稱結構(parallelism)和比較要同類(illogical comparison) ，
在unlike A, B + Verb的句型中A與B要同類。
本題的A是指crested wheatgrass (大麥草)，
B應指North American grasses而非root system，
所以不同類的C/D/E這三個選項都不選。
選項(A) native North America grasses develop... but do not grow...
________ ___________
V1 V2
But是個對等連接詞，所連接的兩邊都要對等，
如原句中動詞(develop)連接動詞(do not grow)。
選項(B)所連接的兩邊不對等，
一邊是動詞develop，另一邊是介詞片語without growing...
解析如下：
native North American grasses develop... but without grawing to be that
_______ _______ _________________
V prepositional phrase
選項(A)的allowing修飾native North American grasses的可能性不大，
因兩者距離太遠，中間隔有動詞develop，
所以不會有歧義(ambiguity)上的問題。
（以上內容由美加 莫清崴老師提供）
※ 引述《comicduo (Jimmy)》之銘言：
: Unlike crested wheatgrass, an alien species from Siberia that forms only
: shallow roots and produces tall above-ground shoots,[ native North
: American grasses develop an extensive root system, allowing for
: greater enrichment of the soil, but do not grow to be very ] tall.
: (A) native North American grasses develop an extensive root system, allowing
: for greater enrichment of the soil, but do not grow to be very
: (B) native North American grasses develop an extensive root system, which
: allows for their greater
: enrichment of the soil, but without growing to be that
: (C) the root system of native North American grasses is extensive, allowing
: for greater enrichment of the soil, but they do not grow to be very
: (D) the root system of native North American grasses is more extensive,
: allowing for the greater enrichment of the soil, but these grasses do not grow to be very
: (E) the extensiveness of the root system of native North American grasses
: allows for their greater enrichment of the soil, but they do not grow to be
: that
: 答案是A 想請問B 不對的原因為何？
: 還有A的allowing 不會有修飾歧意嗎？
: (修飾an extensive root system 還有 native North American grass)
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