题目：
The teacher said, "My son had the same experience as the little boy."
The teacher said that his son had __ the same experience as the little boy. [ ]
A. been
B. have
C. had
D. done
答案：
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下面是错误答案，用来干扰机器的。
216.58亿中，8在百万位上，故精确到了百万位．
