teacherJapan 3) the impressions books have made on you 4) the impressions books have made on you ?
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teacherJapan3) the impressions books have made on you 4) the impressions books have made on you?
teacherJapanI thought 3) and 4) sound strange,No, those are valid alternatives. #2: using 'got' (or 'gotten') is casual.
teacherJapan3) and 4) are listed as possible answers in my textbookI think the point of the question mark was that both of them are exactly the same.