[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.
(B). As the cost of wireless service plummeted in the last year and as mobile phones became increasingly common, many people
(C). In the last year, with the cost of wireless servce plummeting, and mobile phones have become increasingly common, there are many people
(D). With the cost of wireless service plummeting in the last year and mobile phones becoming increasingly common, many people are
(E). While the cost of the wireless service has plummeted in the last year and mobile phones are increasingly common, many people are
大牛說答案是A,但我覺得B也滿順又平衡,是因為因果的關係?
CDE有致命錯誤嗎?謝謝... (�み�;)