how many birds are there __the tree?A.in B.on C.of选哪个?为什么?

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howmanybirdsarethere__thetree?A.inB.onC.of选哪个?为什么?howmanybirdsarethere__thetree?A.inB.onC.of选哪个?为什么?

how many birds are there __the tree?A.in B.on C.of选哪个?为什么?
how many birds are there __the tree?A.in B.on C.of选哪个?为什么?

how many birds are there __the tree?A.in B.on C.of选哪个?为什么?
选A
树上的东西,长出来的用on,飞上去或放上去的用in

a