They took a hell of a risk and suffered a great deal but it______.

  A. paid back    B. paid up            C. paid off     D. paid down

C


解析:

句意：他們冒了很大的風(fēng)險,遭了不少罪, 但事情成功了。paid off用作不及物動詞短語，意思為“得到好結(jié)果；取得成功”。 pay back償還；pay up全部付清；pay down用現(xiàn)金支付。

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