这个It到底代什么？

chasemba · 发表于 2004-9-9 17:11:00

31.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
请问句首的it到底指代什么。答案是a 。

rhod · 发表于 2004-9-9 17:17:00

gg不用重复发帖，我已经在下帖里回复了.

http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=30549&page=1

这个It到底代什么？

这个It到底代什么？

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