- I don't know_____to deal with the old mobile phones.
- It's said that they should be recycled in a special way.（　　）

A．which

B．what

C．how

D．where

【答案】C

【解答】

【點評】

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- I don't know_____to deal with the old mobile phones.- It's said that they should be recycled in a special way.（ ）