Both are grammatically correct, depending on their contexts

来源: rancho2008 于 2015-10-28 23:55:22 [] [旧帖] [给我悄悄话] 阅读数 : (138 bytes)
回答: 请教高手： What I learned is... 由 linfandaisy 于 2015-10-28 23:10:08

If you want to find out whether people actually write that way, you can google "what I learned is" and find examples.

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