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The firemen arrived half an hour ______ the alarm was first raised, when it was
The firemen arrived half an hour ______ the alarm was first raised, when it was
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2025-07-28
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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、after
C、as
D、until
答案
B
解析
从句子后面的分句可知,前面说的应该是警报首次响起的半个小时后消防员到了。since意为“自从……以来”after意为“在……之后”,as意为“当……时候”, until意为“直到……”。根据句意,本题正确的答案选B。[拓展]引导时间状语从句的词有when, before, after, since, until, as soon as, while等,具体用法如下:1)when意为“当……时”,引导时间状语从句,表示主句的动作和从句的动作同时或先后发生。例:He was working at the table when I went in. 当我进去的时候,他正在桌旁工作。2)before意为“在……之前”,引导时间状语从句时,表示主句的动作发生在从句的动作之前;after意为:“在……之后”,引导时间状语从句时,表示主句的动作发生在从句的动作之后。3)since意为“自从……”,主句常用现在完成时,主句常用一般过去时。4) until意为“直到……时”;引导时间状语从句时,表示主句的动作发生在从句的动作之前。当主句的谓语动词是延续性动词时,主句常用肯定形式;当主句的谓语动词是非延续性动词时,主句常用否定形式not…until…意为“直到……才……”,这时的until可以用before来替换。例:I’ll stay here until you come back.我会呆在这里,直到你回来。(stay表示的动作可以持续)He didn’t go to bed until he finished his homework,他直到做完作业才睡觉。(go to bed表示的动作不能持续)5)as soon as意为“一……就……”;表示从句的动作一发生,主句的动作马上就发生。6)while意为“与……同时,在……期间”,while的从句中常用延续性动词或表示状态的词。
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