The dogs helped the police (catch the thieves)划线提问

The dogs helped the police (catch the thieves)划线提问
--------->What did the dogs help the police do?
I like the (white) one best 划线提问
--------->Which one do you like best?
I liked apples better than oranges (意思相同）
---------->I prefered apples to oranges.
We should be kind to animals 句子不变
---------->We should be friendly to animals.

你这题目好乱。。哪句划线

What did the dogs help the police to do?
Which one do you like best?
I prefered apples to oranges.
We are supposed to be friendly to animals.


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