求助：GWD第二套 V13

给出的答案是C，我选了A。C中是acquiring 通过and与converting 并列，但是在做比较时，than后面不是应该象A一样补出谓语动词吗？

Plants are more efficient at acquiring carbon than are fungi, in the form of carbon dioxide, and converting it to energy-rich sugars.

1. Plants are more efficient at acquiring carbon than are fungi
2. Plants are more efficient at acquiring carbon than fungi
3. Plants are more efficient than fungi at acquiring carbon
4. Plants, more efficient than fungi at acquiring carbon
5. Plants acquire carbon more efficiently than fungi

than后面的谓语动词可以补充，也可以不补出；可以倒装也可以不倒装。