I think it should depend on the context,
Generally speaking, if general inform is conveyed by the passage, can should be used
however, if action is emphasized , then I would say use be able to
the teachers in XDF are telling "can" is preferable, but when they don't offer can in the choices, then we have to choose "be able to", if it is offered. Well, I think it depends on the context too. that is a really cool answer. thanks, hl2006...
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