◎ 题干
—Why,I didn’t get you on the phone.
—We ________football on the playground when you phoned.
A.must be playing
B.must play
C.must have played
D.must have been playing
◎ 答案
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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 didn’t get you on the phone.—We ________football on the playground when you phoned.A.must be playingB.must playC.must have playedD.must have been play…”主要考查了你对  【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。