— Micheal, do you know your father wants to buy a piano ?

— Oh, I don’t know or not he’ll buy one. He didn’t tell me .

A．what B．why C．whether

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作文。

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Polysaccharide follicular gel is also found in the membranes (薄膜) where our bones meet. “This idea will help to design a joint prosthesis (人工關(guān)節(jié)),” Kiyoshi Mabuchi, the lead scientist, told the BBC news.

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