My sister is three years ______than I. She is _______young _____go to school.A.young; too; toB.younger; enough; toC.younger; too ;toD.young; so; that
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C解析考查比较级和固定句型。句意“我妹妹比我小三岁，她太小了还不能上学。”than提示用形容词的比较级，排除A、D；enough放在做日常的后面，排除B。too... to“太......而不能做......”。故选C。