He shut himself in the door to do his homework. 此句中shut用作及物动词,意为关上,关闭,这是shut的常用法。shut还有其它用法。如:
① Tell her to shut up. （shut up意为不再谈话,闭嘴。）
② He tried to shut out the view. （shut sb./sth. out意为将某人/某物关在外面,遮住。）
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