The guards (leave) ______ the building by the time the alarm sounded.had left本题考

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问题 The guards (leave) ______ the building by the time the alarm sounded.

选项

答案 had left

解析本题考查动词时态。状语by the time the alarm sounded“警铃响之前”通常表示主句的动作发生在时间状语之前，所以需要使用过去完成时had left。

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