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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