题目内容
________, 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：D
解析：
解析：
|
not only放句首句子要部分倒装。 |
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