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大全133，147，请教各位大虾
147． At a recent session, the French government has decided that Paris needs a second, larger opera house to complement the famous Paris Opera.
(A) has decided that Paris needs
(B) decided that Paris needs
(C) has decided that Paris will need
(D) decided that Paris has a need of
(E) has decided that Paris needed
一直不能从本质上区分过去时和现在完成时，做题的时候总是凭感觉，请问什么情况下用过去时，像此题的答案b一样，有什么明显的理由吗？为什么从句里又用needs了呢？
133*As part of their therapy, young polio victims learning to live with their disabilities were helped to practice falling during the 1950s, so that they could learn to fall without being hurt.
(A) As part of their therapy, young polio victims learning to live with their disabilities were helped to practice falling during the 1950s
(B) As part of their therapy, young polio victims learning to live during the 1950s with their disabilities were helped to practice falling
(C) Young polio victims learning to live during the 1950s with their disabilities were helped to practice falling as part of their therapy
(D) Young polio victims learning to live with their disabilities were helped to practice falling during the 1950s as part of their therapy
(E) During the 1950s, as part of their therapy, young polio victims learning to live with their disabilities were helped to practice falling
这道题我理不出头绪，那位大侠能帮我分析一下解题思路
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发表于 2003-11-5 07:25:00
