gwd9-3

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.

1. Because of wireless service costs plummeting in the last year, and as mobile phones are increasingly common, many people

2. As the cost of wireless service plummeted in the last year and as mobile phones became increasingly common, many people

3. In the last year, with the cost of wireless service plummeting, and mobile phones have become increasingly common, there are many people

4. With the cost of wireless service plummeting in the last year and mobile phones becoming increasingly common, many people are

5. While the cost of wireless service has plummeted
                       in the last year and mobile phones are increasingly common, many people are

请问E的时态是不是有问题呀？我选的是D，不知哪里错了

NN帮忙解答一下吧，多谢

我认为选项E错误在于两个：其一，前半句时间壮语in the last year只能由过去时搭配，而给出的却是现在完成时；其二，more phones应该是are becoming increasingly common. 愚见，不知对否。

分析的有道理!

谢谢!