摘要：10． .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 答案与解析:D not only置于句首时.句子要部分倒装.故选D项.

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