【題目】— 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】

試題分析：句意：-他們的英語(yǔ)說(shuō)得非常完美，他們學(xué)了多長(zhǎng)時(shí)間了？-自從他們7歲的時(shí)候開始。When 當(dāng)……時(shí)候；Since自從；After 在……之后；Until直到……時(shí)候。根據(jù)對(duì)話的意思可知，他們自從7歲就開始學(xué)習(xí)英語(yǔ)了，而且How long have they learnt it使用的是現(xiàn)在完成時(shí)態(tài)，故應(yīng)選B。

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