spend in doing sth花费时间/金钱做某事 I spend one hour in finishing this job.
spend on sth花费时间/金钱在某事上面he spent half an hour on his homework.
spend in doing sth. I spend an hour in doing my homework.
spend on sth. I spend five yuan on this book.
spend sometime （in）doing sth.
spend in : 在…上花费
spend on : 把…花在
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