You must be careful when walking the dog.
这下对了,
是这样的,
当主句和从句主语一致的时候,从句的主语和助动词可以省略
我们看从句,when you are walking the dog
主语you,助动词 are
所以答案
You must be careful when walking the dog.
复合句改为简单句You must be careful when you are walking the dog.不能把
2个回答
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