16、________ , 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
科目：高中英語 來源： 題型：
________ , 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
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