题目内容
____, but it is also a good idea to reduce the potential dangers.
[ ]
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
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
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