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问题: 请教为什么用动词原形

选择题The children were surprised when the teacher had them ___ their books unexpectedly.
A closed B to close C closing D close 答案(D)

解答:

have sb. do sth.
have 后接不带to的不定式作sb.的宾语补足语,表示“让、叫、使某人做某事”。