Sentence Correction (SC) | Re: QOTD: In its journal, the U.S.-based Minor Planet Center

I care what you think I think your explanation is pretty good - it would be even better if you can help us identify which questions are not official GMAT questions at the beginning of your answers. The reason is I find an increasing number of questions that have very odd answer choices and the explanations don't really satisfy me; thus I suspect they are not really official GMAT questions.
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