【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
在线课程【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。