It almost sounds to me like you have a corrupt python install.
In python.exe, IDE, or the python window in ArcMap, I can not repeat. The only time I can get the ... is if I do a multiline entry ( IE, if this == "that":) or nested code.
an import statement should never be "seen" as a multiline entry or nested code.
Curious what happens if you type this:
>>>print "testing"
Do you get:
>>>print "testing"
testing
>>>
or do you get:
>>>print "testing"
...
If you get the latter, I would try a remove/re-install of your python.
R_