有3道语法题请各位指教,望大家解答,谢谢!!

zhanghanbingUID: 2155534

1.In 1850 Jim Beckwourth,a black american explorer, A(discovered) B(in the) mountains of the Sierra Nevada a pass C(soon becoming) an important D(gateway to) California gold-rush country.
" Q* q9 J* c* }( `1 z4 P答案是C,请问应该如何改正那?
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2.The dolls in the collection,A(all) B(more than) two hundered years old,had been C(carefully) carved for childern D(long since) gone.
- t8 Z8 h1 w  j- a7 y# q: G答案是E.  请问long since gone 是固定搭配吗?
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3.Some of the workers A(who resent) the supervisor's authority B(would probably) feel uncomfortable C(if) they were to acquire the indepence that D(they demand)
答案是没有错误.  请问全句的时态都是过去时,但A与D定语从句却是现在时,这是怎么回事?

1 n) I  K' R. Y& ?' g十分感谢!!
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[ 本帖最后由 zhanghanbing 于 2006-9-27 23:08 编辑 ]

dingyu19860324UID: 204706

1 becoming和discovered要时态一致。
2 正确答案是E。你答案错了。
3 从句内部一致即可。
% }: `; u8 f+ d2 [; s- H6 a/ Q你为什么不肯说第 1，2题 来源是OG第5套第4个section？