(   ) 2. ―Look!It        be Jack on the playground.

―It        be him. Because I saw him enter the school library just now.

   A. must,mustn't   B. can,can't

   C. may,mustn't   D. must,can't


2. D must表推測(cè)，意為"一定是"。但這里表示"不可能"，只能用can't。

題目來源：中考英語(yǔ)丟分題修訂版 > 單項(xiàng)選擇

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