The nurse was very busy at that time．She had five childrenA.to be lookedB.to lookC.to look afterD.to be looked after
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C解析分析：本题中的不定式在句中作定语，修饰five children；很显然，five children是look after的对象，因此，不定式应用主动式，look是不及物动词，其后的after不能丢。拓展点：注意句型：（1）have sth．to do中，to do作定语，修饰sth，意为“要做某事”；（2）have sb．doing ／do sth．中的doing／do sth．作句子的宾语补足语，意为“让／使某人做某事”，如：They had the machine working for a whole day．他们让机器工作了一整天。