2. 外语
  3. The guards (leave) ______ the building by the time the alarm sounded.

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

admin2014-10-09  28
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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