I ________ swim when I saw a sign written by the police that meant children under 18 are not allowed to swim without the adults guidance．A.was about toB.wouldC.was going toD.was to
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A解析本句的主要意思是“正当我要游泳时，我看到了……”。B、C、D三项都表示过去将来时，但A项表示更近的将来，意思是“正要、即将”，所以选A项。