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题库 / Prep2008E1-SC-232
The Acoma and Hopi are probably the two oldest surviving Pueblo communities, both dating back at least a thousand years.
both dating
both of which have dated
and each has dated
and each one dating
each one of which date
题目分析：
略。
选项分析：
A选项：Correct. 本选项在语法和逻辑上均是正确的。both dating back at least a thousand years是独立主格结构。
B选项：定语从句both of which have dated at least a thousand years就近修饰名词the two oldest surviving Pueblo communities，这是不正确的。可以被追溯到1000年以前的显然是Acoma and Hopi（请注意，这里the two oldest surviving Pueblo communities是泛指）。
C选项：并列连词and的加入使得前后两句话变成了并列关系。但在逻辑上，显然后半句是对前半句主语的修饰，不能是并列关系。
D选项：并列连词and身后的句子不完整。
E选项：each one of which引导的也是定语从句，该错误同选项(B)。
(b) and (c) are incorrect because of the tense used; "has dated" implies that this is not the case anymore. (this particular construction really only makes sense in the present tense -- or as an -ing modifier attached to a present-tense clause, since -ing modifiers adopt the tense of the clause to which they are attached.)
(e) has subject-verb disagreement ("each one of which" must be singular).
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