Although it takes up much of his spare time, Mr. Smith finds stamp collecting extremely ______.

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问题 Although it takes up much of his spare time, Mr. Smith finds stamp collecting extremely ______.

选项 A、progressive
B、encouraging
C、rewarding
D、challenging

答案C

解析 progressive“进步的;前进的”;encouraging“鼓励的”;rewarding“有回报的,值得做的”;challenging“挑战的,引起争论的”。
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