Present Perfect Tense

Instructions

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Since the beginning of the twenty-first century, people

For some time now, a student

Even senior citizens

Since their introduction into the market, mobile phones

The communications industry

	has preferred that his/her gifts on special occasions be in the form of the latest mobile phone model.
	have more than tripled in sales.
	has never been the same since mobile phones appeared.
	have become aware of the importance of mobile phones.
	have been lured into texting.

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Solutions

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