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
D
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--- Did the book give the information you needed ?
--- Yes. But __________ it, I had to read the entire book.
| A．to find | B．find | C．to be finding | D．finding |