Before it could be transported to be the United States.这里的为什么用could ,不直接用it be

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Before it could be transported to be the United States.这里的为什么用could ,不直接用it be

Before it could be transported to be the United States.这里的为什么用could ,不直接用it be
Before it could be transported to be the United States.这里的为什么用could ,不直接用it be

Before it could be transported to be the United States.这里的为什么用could ,不直接用it be
这个要结合语意啊,即使不用could也不能直接是it be 啊,可以是it is 或 it has been或 it had been