[求助]T3-39

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 are 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

为什么选C不选A呢？

什么时候助动词应该补上呢？

补出动词的目的是为了避免歧义.

对于A,如果没有 are会有歧义.

对于C,将fungi提到前面避免了歧义,所以不需要补出are.

A并没有错,但是C更好,首先避免歧义的排列使之更加简洁,然后哦就是让carbon能够更加靠近作为对其进行补充说明的插入语,"in the form of carbon dioxide".因此C更好.