单选题 It was stupid ______ them to leave their bicycles outside and have them stolen.
【正确答案】 A
【答案解析】[解析] 他们真傻,把自行车放在外面以致被窃。此句中,带逻辑主语的动词不定式短语作主语,it作形式主语,即“it is+形容词+of+代词/名词+不定式”的句型,这类形容词有stupid,wise,wrong,rude,good等。