问题标题:
Nancy,Ihaven’tseenyourparentsforabouttwoweeks.---Yes.They_Americansincetwoweeksago.A.havebeeninC.leftB
问题描述:
Nancy,Ihaven’tseenyourparentsforabouttwoweeks.---Yes.They_Americansincetwoweeksago.A.havebeeninC.leftB
毕凌燕回答:
A
sincetwoweeksago表示一段时间,所以用现在完成时
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