My sister is only two years old, and I have to her on Sunday.A. look forB. look afterC. l

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A. look for
(答案→)B. look after
C. look like
D. look at
解析：look for寻找；look after照顾；look like看起来像……；look at看。句意：我妹妹只有两岁，我星期日不得不照看她。