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他们在一起多久了?
tāmen zàiyīqǐ duōjiǔ le ?
how long have they been together?
多久可以获得健康益处?
duōjiǔ kěyǐhuòdé jiànkāng yìchù ?
how soon will I experience health benefits
笔试成绩有效期多久?
bǐshì chéngjì yǒuxiàoqī duōjiǔ ?
how long is written test result valid for?
你拿到驾照多久了?
nǐ nádào jiàzhào duōjiǔ le ?
how long have you had a license?
