2. 外语
  3. The firemen arrived half an hour ______ the alarm was first raised, when it was too late to save much of the building.

The firemen arrived half an hour ______ the alarm was first raised, when it was too late to save much of the building.

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问题 The firemen arrived half an hour ______ the alarm was first raised, when it was too late to save much of the building.
选项 A、since
B、until
C、as
D、after
答案D
解析 since的意思是“自从…以来”，until的意思是“直到…才”，as的意思是“当…时候”，after的意思是“在…之后”。本句意为：消防员在警报第一次响起的半小时后到达，这时已经太晚，不能挽救大部分建筑。根据题意，正确的答案为D。[知识拓展]“until”引导时间状语从句，如果主句的时态用一般将来时，时间状语从句或条件状语从句用一般现在时表示将来。如：The little boy won’t understand the matter until his father explains to him．直到父亲给他解释后，小男孩才明白了那件事。
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