A. Can we have a dog, Mum?

B. He can't see.

C. Dogs are useful.

D. Grandma Zhang is deaf.

Worker A: Grandpa Li is blind. _____ The dog helps him.

Worker B: _____ She can't hear. The dog helps her.

Mum: Wow! _____ They can do a lot.

Huanhuan: _____

Mum: No, we can't. I'm sorry.

【答案】B D C A

【解析】

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