Quote:
Since 2005, the iPod line of digital music players controlled the MP3 device market.
Here we have a particular time interval from which an effect has started. The effect is being realized in present time also. So, the best form of tense is Present Perfect tense.
Again, the subject of this sentence is "the iPod line" which is singular and needs a singular verb.
Quote:
A. Since 2005, the iPod line of digital music players controlled the MP3 device market
Quote:
B. Since 2005, the
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