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the reason E is wrong is that the whole sentence is talking about the past. When you use the present perfect in option E, you're rather saying that an action started in the past and it is still going on today. That is not what you want to say. You want to talk about an action that happened in the past and is also completed in the past, period.
Re: SC: Complicated question
26 Oct 2008, 02:22
Check out this awesome article about Anderson on Poets Quants, http://poetsandquants.com/2015/01/02/uclas-anderson-school-morphs-into-a-friendly-tech-hub/ . Anderson is a great place! Sorry for the lack of updates recently. I...