My home town has changed a lot ______ I left it.

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问题 My home town has changed a lot ______ I left it.

选项 A、since
B、after
C、when

答案A

解析 since连接的时间状语从句,用在完成时的句子中。since是“自从……以来”;after是“在……之后”;when是“当……的时候”。
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