It was quite a long time______I realized what had happened to the old man.

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问题 It was quite a long time______I realized what had happened to the old man.

选项 A、after
B、when
C、since
D、before

答案D

解析 本题考查时间状语从句。句意:过了很长时间我才意识到老人发生了什么事。固定句型为“It was+一段时间+before+从句”,表示“过了一段时间才/就……”。而“It is+一段时间+since+从句”结构,其句意是“自从……以来已经很久了”,主句中的be动词多为现在时。根据句子结构,本题选D。
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