Plants are more efficient at acquiring carbon than are fungi,in the form of carbon dioxide,and converting it to energy-rich surgars. 这道题的正确选项是C 为： Plants are more efficient than fungi at acquiring carbon 不明白为什么，比较的时候不是不能省略助动词或动词吗？因此做题的时候下意识的就选了有are的A选项，不知道为什么错了，请高手指点。。
A) there is nothing that parallels the non-underlined phrase "and converting it to energy-rich surgars." Look at the simplified correct sentence C), Plants are more efficient than fungi at acquiring carbon and [at] converting it to energy-rich surgars.
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发表于 2010-7-31 22:20:16
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