BarbarawenttotheStatesacoupleofy

发布时间：2020-07-27 12:19:05

Barbara went to the States a couple of years ago,by ________ time she had learned to dance and act in edies．A.whichB.thatC.whatD.whose

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A解析非限制性定语从句中指代物时只能用which，指代人时用who．此题中which作by一词的介宾。
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