How long has Tom (stay)in the USA?stayed还是been stayed,为什么?

问题描述:

How long has Tom (stay)in the USA?stayed还是been stayed,为什么?

正确答案是:stayed
stay 是个不及物动词,不能用于被动语态,如果用been stayed,那么
has been stayed 就构成了【现在完成时的被动语态】,这就违背了基本的语法规则
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