填空题 1 (他过去抽烟很厉害), but now he has given it up.

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【正确答案】 1、He used to smoke heavily, but now he has given it up.    
【答案解析】本题测试used to的用法。过去经常做某事,而现在不是那样,其句型是used to do这句意思正好相对;而be used to doing/sth. 意为“习惯于……”。