[quote="ritjn2003"]
Unlike mainstream American businesses, more than half of which fail, the failure rate for businesses in the Amish community hovers around 5 percent.
(A) Unlike mainstream American businesses, more than half of which fail
(B) Unlike mainstream American businesses, in which the failure rate is more than half
(C) Unlike mainstream American businesses, where more than half of them fail
(D) While the rate of mainstream American businesses failing is more than half
(E) While more than half of mainstream American businesses fail
regarding choice d/
"doing" makes us much trouble.
"doing" as gerund can not go with adjective or noun modifier because it can not possess all functions of a noun. "doing" as a pure a noun can go with adjective or noun modifier
the good learning is good of this country. learning is a pure noun. of course, "learning" can also be a gerund
the good knowing this job is necessary. this is wrong. there is no "knowing" as a pure noun.
knowing this job well is necessary. this is correct.
normally, if there is no "doing" as a pure noun, there must be a noun relevant to "doing". for example, if there is no " knowing" as a pure noun, there is "knowledge" which is relevant to "knowing".
come back to choice D.
"failing" can not be a pure noun. so, it can not go with noun modifier . in "businesses failing", "businesses" can not modify "failing". similarly, "business knowing" is wrong because "business" can not modify "knowing" which is not pure noun. if you want to modify "failing" with "business" , we have to use " business failure". here , "failure" is a pure noun and can be modified by another noun.
so, we have to know the difference between doing as pure noun and doing as a gerund.