11. The growth of the railroads led to the abolition of local times, which was determined by when the sun reached the observer's meridian and differing from city to city,and to the establishment of regional times.
A.which was determined by when the sun reached the observer's meridian and differing
B.which was determined by when the sun reached the observer's meridian and which differed
C.which were determined by when the sun reached the observer's meridian and differing
D.determined by when the sun reached the observer's meridian and differed
E.determined by when the sun reached the observer's meridian and differing
我选的答案是对的，但是不是很理解，哪位帮我分析一下啊？
29.Building large new hospitals in the bistate area would constitute a wasteful use of resources, on the basis of avoidance of duplicated facilities alone.
A.on the basis of avoidance of duplicated facilities alone
B.on the grounds of avoiding duplicated facilities alone
C.solely in that duplicated facilities should be avoided
D.while the duplication of facilities should be avoided
E.if only because the duplication of facilities should be avoided
这道我选了B是错的。帮忙解答啊
54.Tenor George Shirley sang more than 20 leading roles at the Metropolitan Opera since having his debut there as Fernando in Cosifan tulle on October24,1961.
A.sang more than 20 leading roles at the Metropolitan Opera since having
B.sang more than 20 leading roles at the Metropolitan Opera since having had
C.has sung more than 20 leading roles at the Metropolitan Opera since
D.has sung more than 20 leading roles at the Metropolitan Opera after
E.has sung more than 20 leading roles at the Metropolitan Opera subsequently to
我记得看到过一个原则是不能无根据的改变原句时态：原句时态正确的话保持不变。
大家帮我看看这个时态到底用什么？
69.During the ice age, the buildup of ice at the poles and the drop in water levels near the equator speed up the Earth's rotation, like a spining figure skater whose speed increases when her arms are drawn in.
A.like a spinning figure skater whose speed increases when her arms are drawn in.
B.like the increased speed of a figure skater when her arms are drawn in
C.like a figure skater who increases speed while spinning with her arms are drawn in
D.just as a spinning figure skater who increaes speed by drawing in her arms
E.just as a spinning figure skater increases speed by drawing in her arms
这个选A为什么不行啊？为什么选E加JUST 啊？？？
你好，请问下你的大全是哪里下的啊？我找了半天也没找到，你能告诉我一下哪里可以下的到吗？
非常感谢！！！
你打搜索进去就好了。
怎么没人回答问题啊。。。大家帮忙啊
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