| 4. Developing nations in various parts of the world have amassed $700 billion in debts; at stake, should a significant number of these debts be repudiated, is the solvency of some of the world’s largest multinational banks.
(A) should a significant number of these debts be repudiated, is (B) should a significant number of these debts be repudiated, are (C) should they repudiate a significant number of these debts, are (D) if there is a repudiation of a significant number of these debts, would be（A） (E) if a significant number of these debts will be repudiated, is
这里为什么选A, 这句话什么意思?
10. For many people, household labor remains demanding even if able to afford household appliances their grandparents would find a miracle. (A) even if able to afford household appliances their grandparents would find a miracle (B) despite being able to afford household appliances their grandparents would find a miracle (C) even if they can afford household appliances their grandparents would have found miraculous (D) although they could afford household appliances their grandparents would find miraculous（C） (E) even if they are able to afford household appliances which would have been a miracle to their grandparents
D为什么不对? 是时态不对吗?
以上两题请NN指点, 先谢! | 
