It is difficult for us to learn a lesson in life __________ we’ve actually had that lesson.
A．untilB．a(chǎn)fterC．sinceD．when
A。
until的意思是“直到……時(shí)”“在……之前”，如：We always have to wait until the last customer has left. 我們總得等著最后一位顧客離去。
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