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The boy is so young that he___come out at night by himself.

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The boy is so young that he___come out at night by himself.
A.dares not B.dares not to C.doesn't dare D.didn't dare to
答案是c为什么其他选项不行呢?
The boy is so young that he___come out at night by himself.
首先确定选择第三人称单数,排除了D.从DARE 这个词来看,它可以做助动词也可以做及物动词,这里面我们看
1.敢;竟敢
How dare you ask me such a question?
你怎敢问我这样的问题?
My younger sister dare not go out alone.
我妹妹不敢单独出去.
及物动词 vt.
1.敢;胆敢[+to-v]
He did not dare to leave his car there.
他不敢把车停放在那里.
2.挑逗,激[O2]
I dare you to cheat me.
谅你也不敢欺骗我.
3.敢于面对,敢冒(险)
由此我们知道这里他是一个实意动词了,所以就用了助动词加了否定词