【题目】What ____ we doing? ( )
A.amB.isC.beD.are
【答案】D
【解析】
句意：我们在做什么？be动词用法：I用am，you用are, he/she/it等单数主语用is，复数用are。本题中的主语为we，所以be动词用are，故选D。
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