问题
____, 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
正确答案是：
同类题型
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