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问题: 大学英语2 阶段作业3 系列问题19 需给出详细解释

19.Where is Bob? He_____________ on the playground ten minutes ago.
A.was playing
B.played
C.had played
D.has played

解答:

Where is Bob? He_____________ on the playground ten minutes ago.
A.was playing
B.played
C.had played
D.has played
A
十分钟前他正在操场上玩。 用过去进行时, 表示10分钟前正在进行的动作。