◎ 题干
— Why! I _____ get you on the phone.
— We ______ basketball on the playground when you phoned.
A.didn't; must be playing
B.couldn't; must be playing
C.couldn't; must have played
D.didn't; must have been playing
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— Why! I _____ get you on the phone. — We ______ basketball on the playground when you phoned. A.didn't; must be playingB.couldn't; must be playingC.couldn…”主要考查了你对  【虚拟语气】【情态动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。