[题目]- They speak perfect English. How long have they learnt it?- they were seven years old.A. When B. Since C. After D. Until 题目和参考答案——青夏教育精英家教网—

【题目】— They speak perfect English. How long have they learnt it?

— ______ they were seven years old.

A. When B. Since C. After D. Until

【答案】B

【解析】

试题分析：句意：-他们的英语说得非常完美，他们学了多长时间了？-自从他们7岁的时候开始。When 当……时候；Since自从；After 在……之后；Until直到……时候。根据对话的意思可知，他们自从7岁就开始学习英语了，而且How long have they learnt it使用的是现在完成时态，故应选B。

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