SAT替换题求助!The Pony Express was an ingenious system forcarryin

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SAT替换题求助!
The Pony Express was an ingenious system for
carrying mail; it was in existence only briefly,
however,before the telegraph system made it
obsolete.
(A) mail; it was in existence only briefly,
however,
(D) mail,having existed only briefly
(E) mail,but was existing only briefly
D错在哪里?

1.Having existed的伴随状态要放在修饰的那个词的后面~如果是放在 carrying mail的后面会产生歧义~改错里经常有这样的错误的~
2.D里面没有转折的意思~however的意思没有了~改变了句意
3.was existing 更强调一种存在的状态~表示在那段时间的存在~而having existed强调存在过的事实~前者更好..

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