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职称英语
The guards(leave)______ the building by the time the alarm sounded.had left本题考查动
The guards(leave)______ the building by the time the alarm sounded.had left本题考查动
游客
2024-06-26
62
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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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