问题描述：
A computer does only what thinking people _____. (99上海19)
A. have it do B. have it done C. have done it D. having it done
为什么选A？
问题解答：
have something do 使某物做某事
have something do be done 是某物被做某事
这里computer 和 do 是主动关系
have这里不是完成时的标志，而是使役动词“让，使”
people have it do
人们让它做的事
have sb do 让某人做某事
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