试题 Is it ____sparing time for your hobby while.

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试题 Is it ____sparing time for your hobby while.
试题 Is it ____sparing time for your hobby while your classmates are concentrating on their lessons?
为什么不能用WORH 而是WORTHWHILE?
刚刚在百度上倒是查到了一个白痴的解释,希望强人能帮我细心解决

在这种it 作形式主语的句子中,并且后面是doing形式时,我感觉可以互换的,好像worth不能加to do这个

试题 Is it ____sparing time for your hobby while. what is your hobby?it is ( ) what is your hobby what is your hobby? your hobby what it is//错在哪? It is the time you have wasted for your rose that makes your It is the time you have waste for your rose that makes your It is time for school It is time for sports it is time for sleeping It is time for go Is it time for breakfast?