. It is difficult for us to learn a lesson in life __________ we’ve actually had that lesson.

A. until   B. after

C. since   D. when

A。


解析:

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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