Sometimes, there are as many as 100 birds singing in the tree
There are as many as 100 birds singing in the tree sometimes
Dorda应该是对的
Sometimes there are up to as many as one hundred birds singing in this tree. up to 多达as many as 一样多，100只一样多，就是一百只
Sometimes there are as more as 100 birds singing in the tree.
up to；no less than；much as
BACKWARDS有向后退的意思，返回的，落后的，back,使后退，向后面，我觉得填backwards，至于你的第一个问题，我感觉要看语境的
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偶是吃货范范
