问题
选择题
_______,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
not only放句首句子要部分倒装。
少了些燥热；