【高考英语单选题Weareallembarrassedatthesight:SomeChinesevisitors_____rubbishontheGreatWall,followedbyaforeigner_____upthelitter.A.dropping;pickedB.dropping;pickingC.dropped;pickingD.dropped;picked第一空为什么】
高考英语单选题
Weareallembarrassedatthesight:SomeChinesevisitors_____rubbishontheGreatWall,followedbyaforeigner_____upthelitter.
A.dropping;pickedB.dropping;pickingC.dropped;pickingD.dropped;picked
第一空为什么填dropping不填dropped

