Mr Green asked Lily she had written to her father .A. whether ; the day beforeB. whether

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(答案→)A. whether ; the day before
B. whether ; yesterday
C. that ; the day before
D. that ; yesterday
解析：考查宾语从句和固定词组。前一天the day before ;句意：Mr Green问Lily前一天她是不是给她爸爸写信了。故使用whether是否。故A正确。