摘要：George couldn't remember when he first met Mr.Anderson.but he was sure it was Sunday because everybody was at church. 解析:句意:虽然George记不起他第一次见Mr.Anderson的时间.但他确信是个星期天.因为大家都去做礼拜.该空表示泛指.用不定冠词. 答案:a

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