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A computer does only what people __.

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A computer does only what people __.
A.having it do
B.have it done
C.have it do
为什么?
请详细说明每个选项.
A computer does only what people __.
首先what引导的是个宾语从句,从句是个句子所以得有谓语动词,排除A选项,分词形式不可充当从句的谓语动词.
另,have是使役动词,有三个结构,
have sth.done(使...被...－动作和sth.之间被动关系）.
have sth.doing（使...长时间保持某一状态）
He had me waiting for a long time.他让我等了很长时间.
have sth.do (使...去做..-动作和sth.之间主动关系)
此句中,电脑只会做人们让它做的事.do是电脑发出的动作,而不是电脑被做,所以主动关系,用have sth.do
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