We go out when it rained.A. were about toB. were aboutC. wouldD. were

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(答案→)A. were about to
B. were about
C. would
D. were
解析：考查固定结构.固定结构be about to do sth when…正要做某事在这时…（发生了意料之外的事情）；句意：我们正要外出，在这时天开始下雨了。故A正确。