) I had been studying Science a year earlier. (past perfect continuous verb) The difference between the continuous form and the non-continuous form is consistent among all the tenses. The difference between your two sentences is about the same as the difference between these two: I studied yesterday.
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AnonymousI had studied science a year earlier.............................. [studied]< .... one year .... >[R] ........................ [NOW]
AnonymousI had been studyi