【正确答案】 B

【答案解析】[解析] 画线词的原形tend为动词，意为“照料，照顾”。A项的原形look for意为“寻找，渴望”；例：We must look for a shady place.我们得找一个有树荫的地方。B项的原形take care of意为“照顾，照料”；例：The two sisters took care of their sick mother by turns.两姐妹轮流照料生病的母亲。C项的原形keep up意为“保持，继续”；例：I hope the weather will keep up.我希望天气继续晴朗。D项的原形care for意为“关心”；例：To care for him, you need to care for yourself first.要想照顾好他，你需要先照顾好自己。故本题选B。