Plants are more efficient at acquiring carbon than are fungi, in the form of carbon dioxide, and converting it to energy-rich sugars. 其中B选项是这样的:Plant are more efficient at acquiring carbon than fungi, 我想问的是这里要补出动词应该补出的是be 还是are?如果补出应该放在fungi之前还是之后啊? 另外还听过一说:说什么如果是be动词的话在比较中是不能省略的,这个是对的还是错的?如果是对的是什么意思? 谢谢啦