Peter’s father asked him to spend his time on something _________ researching into instead of playing all the time.

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问题 Peter’s father asked him to spend his time on something _________ researching into instead of playing all the time.

选项 A、worthy
B、valuable
C、worth
D、previous

答案C

解析 worth意为“值得”,后面一般跟动名词表示的主动形式表达被动含义,意为“值得做”;worthy在表示“值得做某事”时,一般使用worthy of doing sth,或worthy to be done;而previous(宝贵的)和 valuable(有价值的)在词义和用法上均不符合题意。
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