问题描述：
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
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
问题解答：
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