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.
A.Because of wireless service costs plummeting in the last year, and as mobile phones are increasingly common, many people
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 service 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 wireless service has plummeted in the last year and mobile phones are increasingly common, many people are
D正确，我错选E
（1）E很多人解释说while表示转折，这里没有这个含义，可是prep语法笔记里面清清楚楚写着while有表“当……时”的意思
而且，以下是Longman给出的while的第一个解释
1、during the time that something is happening
They arrived while we were having dinner.
While she was asleep, thieves broke in and stole her handbag.
She met Andy while working on a production of Carmen.
（2）看到有人说请教了美国的同事， 给出一个理由说如果一个句子前半句用了现在完成时，则and连接的后半句要时态一致，想请问下大家有这个规定吗？如果前后都是现在类的时态不可以吗，一定要都是完成时吗？
（3）好像在prep里面也有讲到，in the last year 和 in last year的区别，我记得有一个是要搭配现在完成时的，好像就是in the last year，不知道是不是我记错了，一时也找不到那个知识点了，所以跟大家求证下。
谢谢大家了！ | 
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发表于 2011-5-31 11:37:36
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