one thing that I want to do but never had time to do is that travel around the world.是用travel还是traveling这里that是不是省不省略都行吧？加上也没事吧？

one thing that I want to do but never had time to do is that travel around the world.是用travel还是traveling这里that是不是省不省略都行吧？加上也没事吧？
one thing that I want to do but never had time to do is that travel around the world.是用travel还是traveling
这里that是不是省不省略都行吧？加上也没事吧？

one thing that I want to do but never had time to do is that travel around the world.是用travel还是traveling这里that是不是省不省略都行吧？加上也没事吧？
is to travel(或者traveling) around the world.
总之不能用原形,不然句子有两个谓语了
补充：如果要用that的话,那它后面要跟一句完整的话；如果只是一个名词性词组,如traveling around the world则不能加

去掉that 直接 is travelling 。毫无疑问的，that后边加句子，that必须去掉

用travel

用traveling，这是一个名词性状语从句，所以得用它。

travel
前面省略了 l want to

用traveling动名词，表示旅行的动作，而不是名词。

应该用traveling。
“traveling around the world”在that后面实际上是一个名词短语，也就是that traveling around the world共同作为do的宾语，作为宾语的话，只能是名词短语，当然是ing形式啦~！

去掉that，用travelling
that后面是要跟完整的句子的，

这句有点累赘，读起来太累。简洁一点两个that都不要，如下：
One thing I wanted to do but never had time is to travel around the world.
这样的复合句组，结合了下面两个句子：
I wanted to travel around the world.
I never had time to travel around the world.