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:

由語境邏輯可知,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)時間狀語從句。

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