_______,but it is also a great way to lower the number of greenhouse gases in the air.

A．Not only a fun thing is it to do      B．Not only a fun thing to do it is

C．Not only it is a fun thing to do      D．Not only is it a fun thing to do

D


解析:

D句意：這件事情不但是一件有趣的事，而且是一種降低空氣中溫室氣體的有效途徑。否定詞位于句首時(shí)，應(yīng)使用部分倒裝。

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