He tried to skate,but he ___ A.fall down B.fell over C.falled up求高手帮帮帮帮帮帮帮!

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• He tried to skate,but he ___ A.fall down B.fell over C.falled up求高手帮帮帮帮帮帮帮!
• He tried to skate,but he ___ A.fall down B.fell over C.falled up
• after a heavy rain,the wall (fell down)为什么不是fall down?
• The telephone lines were brought down by the trees and branches.A.fall B.fallen C.fell D.falling所给答案是D,但我认为是B.应该是落下的树枝,动作已经发生.