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    【题目】The hero said he didn’t think twice ____ diving into the freezing river to rescue that child.

    A. before B. after C. until D. when

    【答案】A

    【解析】句意：这位英雄说他没有三思跳进冰冻的河里去救那个孩子not …before 为固定搭配，not...until...着重的是结果，not...before...着重的是过程，not before 不早于not until 直到.才.not until 一般不放在句首，如果放在句首一般就是强调倒装句。 before 放在句首也并不表示很强的强调。 在很正式的场合多用 before。

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