The American doctor has been there___.A.in three weeksB.three weeks agoC.has leftD.for over three weeks

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TheAmericandoctorhasbeenthere___.A.inthreeweeksB.threeweeksagoC.hasleftD.foroverthreeweeksTheAmerica

The American doctor has been there___.A.in three weeksB.three weeks agoC.has leftD.for over three weeks
The American doctor has been there___.
A.in three weeksB.three weeks agoC.has leftD.for over three weeks

The American doctor has been there___.A.in three weeksB.three weeks agoC.has leftD.for over three weeks
D for 加一段时间,前面要用完成时