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引導(dǎo)時(shí)間狀語從句,意為“直到……”,表示主句的動(dòng)作一直延續(xù)到until從句中動(dòng)作發(fā)生前。after 意為“在……之后”。since 意為“自從”,常與現(xiàn)在完成時(shí)連用,表示動(dòng)作從過去的某個(gè)時(shí)候開始,一直延續(xù)到現(xiàn)在的動(dòng)作。when 意為“在……時(shí)候”。

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