there is a tall tree,can you _____.let me try.youmust be careful ,or you may _______A climb up it fall off it B climb it up fall of itC climb it up fall it off为什么

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thereisatalltree,canyou_____.letmetry.youmustbecareful,oryoumay_______AclimbupitfalloffitBclimbitupf

there is a tall tree,can you _____.let me try.youmust be careful ,or you may _______A climb up it fall off it B climb it up fall of itC climb it up fall it off为什么
there is a tall tree,can you _____.
let me try.
youmust be careful ,or you may _______
A climb up it fall off it B climb it up fall of it
C climb it up fall it off
为什么

there is a tall tree,can you _____.let me try.youmust be careful ,or you may _______A climb up it fall off it B climb it up fall of itC climb it up fall it off为什么
up off在这里是介词,只有当动词和副词组成的短语时代词要放在二者之间

climb up sth 表示爬上某物
fall off sth 表示从某物上掉下来
句中or表示否则