RonPurewal Wrote:2. ' able to ' and ' able to be ' looks awkward in the sense that they have added more words when we have a precise 'can/could'
the problem is worse than that. it's actually WRONG to use 'able' here.
read:
https://www.manhattanprep.com/gmat/foru ... tml#p94106
let's ask ourselves: who is ABLE (or unable) to do something here?
the issue is that humans are able to consume only X amount of these substances (before they get cancer, presumably).
so it makes sense to say "humans are able...", but not "carcinogens are able...".
I just want to be more clear about this quetion. Do you mean that "are able to be aonsumed " in D is wrong? what about " are able to " in C?
I think it is Ok to use both "can" and "be able to" in choice C. Is it right?