问题标题：
1.Afterthehigh-rankingofficials_____,thecurtainroseandtheplaybegan.A.wasseatedB.hadseatedC.wereseatedD.weresat2.Theoldmanwasrundownbyacar.Hewastakentohospitaland_____onbythechiefsurgeonrightnow,A.operatedB.havingb
问题描述：
1.Afterthehigh-rankingofficials_____,thecurtainroseandtheplaybegan.
A.wasseatedB.hadseatedC.wereseatedD.weresat
2.Theoldmanwasrundownbyacar.Hewastakentohospitaland_____onbythechiefsurgeonrightnow,
A.operatedB.havingbeenoperatedC.isoperatedD.isbeingoperated
请说明选择的原因说的好我会加分的
唐京海回答：
C.主语是复数.“高级军官们就座后,幕布升起,开始表演.”
D.根据rightnow判定为现在进行时.“那个老头被车撞了.他被送到了医院,现在主任医师正在给他动手术.”
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