She spent half an hour ________ from one dress to another before selecting the one she wanted．A.choosingB.on choosingC.to choosingD.to choose
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A解析动词spend的用法是spend some time (in) doing sth／spend some time on sth意思是“花时间做某事（在这个词组中介词in可以省略，但是介词on是不能省略的）”。