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He needs to spend time on his homework.
其中的on可以改为in吗?
因为我知道有spend time (in) doing sth.既然in后面可以跟动名词,那好像就可以跟名词的吧?
人气：260 ℃ 时间：2019-09-24 06:14:05
解答
He needs to spend time on his homework.==He needs to spend time( in) doing his homework
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