Because of wireless service costs plummeting in the last year, and as mobile phones are increasingly common, many people now using their mobile phones to make calls across a wide region at night and on weekends, when numerous wireless companies provide unlimited airtime for a relatively small monthly fee.
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ABecause of wireless service costs plummeting in the last year, and as mobile phones are increasingly common, many people
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BAs the cost of wireless service plummeted in the last year and as mobile phones became increasingly common, many people
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CIn the last year, with the cost of wireless service plummeting, and mobile phones have become increasingly common, there are many people
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DWith the cost of wireless service plummeting in the last year and mobile phones becoming increasingly common, many people are
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EWhile the cost of wireless service has plummeted in the last year and mobile phones are increasingly common, many people are
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正确答案: D