GWD2-13 /og12th_18关于平行中的介词补出和成分

千与千寻117

GWD2-13

Plants are more efficient at acquiring carbon than are fungi, in the form of carbon dioxide, and converting it to energy-rich sugars.
A Plants are more efficient at acquiring carbon than are fungi
B Plants are more efficient at acquiring carbon than fungi
C Plants are more efficient than fungi at acquiring carbon
D Plants, more efficient than fungi at acquiring carbon
E Plants acquire carbon more efficiently than fungi


选C是明白啦  比较对象是plants and fungi  但是有两个疑问
1.比较的是efficient at acqiuring ...and converting...
为何converting前不加at 呢  不是说平行中的介词补出的么
2.Plants are more efficient at acquiring carbon 中 carbon 在句子中是什么成分 是介宾中的宾语么

千与千寻117

求教

abjure

up, 同问

12604698

be efficient at doing
其实是Plants are more efficient  at acquiring carbon  and converting it to energy-rich sugars than fungi 。这里头重脚轻了，把短的比较放前面了。 carbon 算是介宾的宾语吧，反正类似。 就像be good at playing football中的football是的。
比较的是主语plants和fungi

lan0604

求问……为什么OG中解释说A选项是fungi成了in the form of 的主语呢？！