【求助】3道SC题目

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大全189  roponents ofartificial intelligence say they will be able to make computers that canunderstand English and other human languages, recognize objects, and reason asan expert does—computers that will be used to diagnose equipment breakdowns,deciding whether to authorize a loan, or other purposes such as these.
(A)as an expert does—computers that will be used to diagnose equipment breakdowns,deciding whether to authorize a loan, or other purposes such as these
(B)as an expert does, which may be used for purposes such as diagnosing equipmentbreakdowns or deciding whether to authorize a loan
(C)like an expert—computers that will be used for such purposes as diagnosingequipment breakdowns or deciding whether to authorize a loan

(D)like an expert, the use of which would be for purposes like the diagnosis ofequipment breakdowns or the decision whether or not a loan should be authorized（C）
(E)like an expert, to be used to diagnose equipment breakdowns, deciding whetherto authorize a loan or not, or the like


答案为C。E不行在哪里？



大全243
 Developing nations in variousparts of the world have amassed $700 billion in debts; at stake, should asignificant number of these debts be repudiated, is the solvency of some ofthe world’s largest multinational banks.
(A) should asignificant number of these debts be repudiated, is
(B) should asignificant number of these debts be repudiated, are
(C) should theyrepudiate a significant number of these debts, are
(D) if there is arepudiation of a significant number of these debts, would be（A）
(E) if asignificant number of these debts will be repudiated, is
这道题如何解啊？完全看不懂。。。


大全908      The proposed urban developmentzones do not represent a new principle; it was employed in “Operation Bootstrap”in Puerto Rico.
(A) do notrepresent a new principle; it
(B) represent nota new principle, but one that

(C) are not a newprinciple; the same one
(D) are not a newprinciple, but one that（B）
(E) are not new inprinciple; it
答案为B。可是，答案的语法没有问题吗？

xwj荣誉出品

顶啊 顶啊 是不是问题太多了... 怎么没人回答呢？