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题库 / GMATLA-SC-33
Unlike mainstream American businesses, more than half of which fail, the failure rate for businesses in the Amish community hovers around 5 percent.
Unlike mainstream American businesses, more than half of which fail
Unlike mainstream American businesses, in which the failure rate is more than half
Unlike mainstream American businesses, where more than half of them fail
While the rate of mainstream American businesses failing is more than half
While more than half of mainstream American businesses fail
题目分析：
略。
选项分析：
A选项：Unlike身后是商业（mainstream American businesses），而其主句的主语是失败率（the failure rate for businesses），两者不可比。
B选项：比较错误同选项(A)。
C选项：比较错误同选项(A)。
D选项：本选项的错误在于表语上，因为选项的主语是rate，是一个比率，而表语是half，在逻辑上比率只能是50%（50percent）而不能是一半，即，我们可以说：
the rate of mainstream American businesses failing is 50%.
但不能说：
the rate of mainstream American businesses failing is half.
E选项：Correct. 本选项在语法和逻辑上均是正确的。
Ron:
C:the major problem with (d) is the incorrect construction "of + NOUN + VERBing".
also, it's unidiomatic to say that a RATE is "half" (or "more/less than half"). you could say that a rate is 50%, but not "half".
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