First, my usual disclaimer: the GMAT spends between $1500 and $3000 developing every GMAT question, and even the best test-prep companies can't compete with that. Like many non-official questions, this one doesn't quite seem like the real thing to me.
That said... well, the OA isn't too bad in this case.
As others have pointed out, this question is mostly about parallelism. "Some soundswere intended as a warning call, while others ______ or _______." Logically, whatever is in those
...
That said... well, the OA isn't too bad in this case.
As others have pointed out, this question is mostly about parallelism. "Some soundswere intended as a warning call, while others ______ or _______." Logically, whatever is in those
...
![FLO – Therapy at the Club – Pre-Single [iTunes Plus M4A]](http://is1-ssl.mzstatic.com/image/thumb/Music221/v4/a4/11/88/a41188ed-0f2e-e8d5-1163-d59e373cc58c/26UMGIM30046.rgb.jpg/208x208bb.webp)
