The number 911 is a speacial number ,____I think ,that will

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The number 911 is a speacial number ,____I think ,that will be remembered by the Americans forever
A what
B it
C which
D one
要有理由,

D
数字911是个特殊的号码,一个,我认为,将永远被美国人记住的号码.
I think是个插入语.
后半句话结构为：
._________that will be remembered by.
显然,that在此引导一个定语从句.已经有了关系代词that,显然不能再用其他关系词,如what, which,先排除AC.
那么,空格处缺少的应该是一个名词或代词,作为先行词.排除B,因为it没有这种作为先行词的用法.
选择one,代替的是a special number, 和它构成了同位结构,又充当定语从句的先行词.

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