The robber had escaped and was nowhere to be found when the police______.

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问题 The robber had escaped and was nowhere to be found when the police______.

选项 A、arrived
B、had arrived
C、arrive
D、have arrived

答案A

解析 本题考查动词时态。when引导的是时间状语从句,主句是过去完成时,从句用过去时。
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