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。
由語(yǔ)境邏輯可知，人的一生難以吸取教訓(xùn)的狀態(tài)一直延續(xù)到真正有了教訓(xùn)，因此該空應(yīng)填until引導(dǎo)時(shí)間狀語(yǔ)從句。
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