— I went to your house yesterday afternoon, but you were not in.— Sorry. I _______ basketball with my classmates.A.am playingB.was playingC.playedD.have played
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B解析试题分析：此题考查过去进行时的基本用法和构成，表示昨天下午你去找我的那个时刻我正在打篮球，故选B。考点：过去进行时的基本用法和构成
点评：过去进行时表示过去某个时刻正在进行的动作或存在的某种状态。