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Information and opinion gap exercises have to have some cont

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Information and opinion gap exercises have to have some content ____talking about.
A.worthwhile B.worthily C.worth D.worthy 我知道选C可是对为什么不能选A感到疑惑~A不是也可以接Doing而且 表示有意义而值得.的么
Information and opinion gap exercises have to have some cont
worth 与 worthwhile 虽然后均可接doing,但还是有些区别的;
worthwhile 相当于worth while,这样代入句中可有效判断其与worth的区别.
The problem is worth considering.(不用worthwhile)
It is worth considering the problem.(可换用worthwhile)
另外,worthwhile可直接作形容词表语,而worth不行,只可be worth doing短语
Considering the problem is worth while (不用worth)
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