Last Sunday I went to see my grandma________she was ill．A.becauseB.ifC.thoughD.until
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A解析分析：Last Sunday I went to see my grandma和she was ill之间是因果关系，所以用because．(延伸)原句可以转换成My grandma was ill，so I went to see her last Sunday．注意中文“因为……所以……”表达为英语时，用了because就不能用so．