Itake care of my little sister at home today. A. will canB. haveC. hadD. have to.

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A. will can
B. have
C. had
(答案→)D. have to.
解析：短语：have to 不得不，根据后文时间状语today ，可排除C，A选项中will can不能同时使用可排除，have实义动词，有，句意：我今天不得不在家照顾我的小妹妹。所以答案为D。