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6.2 worth 的用法

    worth,worthy,worth-while都为adj. 意为"值得"。
    1. worth: be worth + n.  当名词为金钱时,表示"…… 值得……"
     be worth doing sth. "……某事值得被做"
       The question is not worth discussing again and again.

    2. worthy:be worthy of +n. 当名词为抽象名词时表示"……值得……"
     be worthy to be done "某事值得被做"
       The question is not worthy to be discussed againand again.

    3. worth-while: be worth-while to do sth  "值得做某事"
      worth while: It is worth while doing sth
             It is worth while sb to do sth.

    典型例题
    It is not ____ to discuss the question again and again.
    A.worth B.worthy C.worth-while D.worth while
    答案C. 由worth的用法可知,此句只适合词组be worth-while to do sth.。因此选C。

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