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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引導時間狀語從句,意為“直到……”,表示主句的動作一直延續到until從句中動作發生前。after 意為“在……之后”。since 意為“自從”,常與現在完成時連用,表示動作從過去的某個時候開始,一直延續到現在的動作。when 意為“在……時候”。

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