_______,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 doB．Not only a fun thing to do it is
C．Not only it is a fun thing to doD．Not only is it a fun thing to do
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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