2题大全请教

It may someday be worthwhile to try to recover uranium from seawater, but at present this process is prohibitively expensive

(A) It may someday be worthwhile to try to recover uranium from seawater

(B) Someday, it may be worthwhile to try and recover uranium from seawater

(C) Trying to recover uranium out of seawater may someday be worthwhile

(D) To try for the recovery of uranium out of seawater may someday be worthwhile

(E) Recovering uranium from seawater may be worthwhile to try to do someday

请教A和C的区别

The suspect in the burglary was advised of his right to remain silent, told he could not leave, and was interrogated in a detention room.

(A) of his right to remain silent, told he could not leave, and was

(B) of his right to remain silent, told he could not leave, and

(C) of his right to remain silent and that he could not leave and

(D) that he had a right to remain silent, could not leave, and was

(E) that he had a right to remain silent, that he could not leave, and was

答案是B，但是interrogated 和什么平行呢？感觉A比较好，

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recover from,固定搭配。it is worthwhile to do这种句型ETS喜欢，trying表示正在进行意思不对。

was advised, (was) told, (was) interrogated. 要省就都省，要么就不省。

第二题：参见：http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=5165

不能只针对语法知识（省略/并列）这些细节部分去做题，容易见木不见林；从句子的整体意思去把握，将更利于做出此道题！