175. (GWD-9-Q3)
Because of wireless service costs plummetingin the last year, and as mobile phones are increasingly common, many people now using their mobile phones to make callsacross a wide region at night and on weekends, when numerous wireless companiesprovide unlimited airtime for a relatively small monthly fee.
A. Because of wirelessservice costs plummeting in the last year, and as mobile phones areincreasingly common, many people
B. As the cost ofwireless service plummeted in the last year and as mobile phones becameincreasingly common, many people
C. In the last year,with the cost of wireless service plummeting, and mobile phones have becomeincreasingly common, there are many people
D. With the cost ofwireless service plummeting in the last year and mobile phones becomingincreasingly common, many people are (D)
E. While the cost ofwireless service has plummeted in the last year and mobile phones areincreasingly common, many people are 正确解为D，
我的问题是，如果B的两个动词改为现在时态，而且主句补出be动词，是否就是正确？
如果是的话，as状语从句又能否和with独立主格结构互相替换？两者有否逻辑区别？
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发表于 2013-11-25 07:38:48
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