问题描述：
___________ the richest man in the world.
A Bill Gates says to be B It is said Bill Gates to be C It says Bill Gates to be
D Bill Gates is said to be
为什么选D,
A Bill Gates says to be B It is said Bill Gates to be C It says Bill Gates to be
D Bill Gates is said to be
为什么选D,
问题解答：
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