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问题: 英语问题

As your instructor advised, you ought to spend your time on something ____ researching into.
A. precious B. worth C. worthy D. valuable
这道题怎么做??拜托大家给我讲一下……
顺便能告诉我一下worth和worthy的区别么?

解答:

答案是(B)   (A) precious:"宝贵的;完全的"。(B)worth:"值得的"。worth后面一般跟动名词表示"值得做某事",而(C)worthy也表示"值得做某事"时,一般的用法是worthy of doing.或worthy to be done。(D)valuable:"有价值的,值钱的",比较词义和用法,(B)为最佳答案。