Could you please tell me the difference between "has" vs "has been". 2) the idea has been deleted what is the difference between these two? Feb 17, 2015there has been many instances of outbreaks in vaccinated populations vs.
There have been many instances of outbreaks in vaccinated populations? Mar 4, 2018that's why has been detected would be the correct choice here: Neither (one) has been detected in the lab in isolated form yet.
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