Because many of the minerals found on the ocean floor are still ___on land, where mining is relatively inexpensive,mining the ocean floor has yet to become a ___enterprise.
A.scarce..common
B.accessible..marginal
C.unidentified..subsidized
D.conserved..public
E.plentiful..profitable
答案选E,has yet to 翻译成“还没有”吗?可是人家没有否定啊。。。
你要看yet在句子里的位置来决定yet的意思
He gives yet another reason 这里yet的作用是conjuction就是 besides
He is smart, yet unscrupulous. 这里的yet也是conjunction 但是是 nevertheless
Where mining is relatively inexpensive, mining the ocean floor has yet to become a xxxx enterprise 这里的yet是but, however
不推荐你翻译成中文 有百害而无一利
但是我认为这个题的真正逻辑关系就是because引导的因果顺承,因为陆上矿点还是很丰沛,因此海下开矿并不有利可图,have yet to 应该是一个固定搭配,意思是“还没有,尚未”之类的,是否定的意思。
至于固定职业相对应的固定词汇搭配,陈圣元老师《GRE句子填空》第一章确实讲了不少,建议楼主可以看看记下。
这边的yet 表示 up to now:常常用于表示在一个动作还没完成
比较常用的搭配为 have yet + to do
a (1) : up to now : so far <hasn't done much yet> —often used to imply the negative of a following infinitive <have yet to win a game>
Because many of the minerals found on the ocean floor are still ___on land, where mining is relatively inexpensive,mining the ocean floor has yet to become a ___enterprise.