谁帮我解释解释这几题呀！

xianghui4UID: 2208358

先有2道改错题，请高手们帮小弟我解释一下。
% l9 i( D" N7 L1 ]% u" ^the delegates coiming this far, they did not want to return without accopmlishing something.
C) Having come this far, the delegates
- ?9 G5 ^8 ~& M7 N; h- g  q. `D) To come this far, the delegates
* x, n4 k3 j. C
  d8 ~# \8 w" A$ B8 J2 t1 s- m7 m! k我选D，可答案是C，请大家解释一下。

Q2，
  X& {" g2 l! M- s+ a! O4 n% [* _The new bird sanctuary, consisting of one hundred acres of unspoiled tideland , and is protected by the state.
A)  sanctuary, consisting of one hundred acres of unspoiled tideland , and is protected by the state
7 ?  x% _: r7 g; Z: K/ uC)  sanctuary, consisting of one hundred acres of unspoiled tideland , is protected by the state
A 和C的区别是多了个and，小弟我对如何使用comma和and不太清楚，如何有N个分句需要话，需要几个comma，几个and，一共加起来几个，希望大家帮忙解答一下，我在这谢谢了。

xianghui4UID: 2208358

补充一下，第2到答案是C

amyceresUID: 2206721

第一题用to do的话是表目的，不符合，这里应该找个表示原因的
" Z. P) V. l" R6 K5 r
( T# i+ J. B0 J8 Q找主谓，如果选了A，and连接两个句子，需要两套主谓，所以不行，选C

xianghui4UID: 2208358

哦，那就是说and只能连接句子，这里仅仅是1句话，不能用and 连接，因为最后的部分没有主语。

amyceresUID: 2206721

yep~
" x6 w: y3 g7 j! B& wyou got it~~~