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题库 / Prep2008E2-SC-175
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.
Because of wireless service costs plummeting in the last year, and as mobile phones are increasingly common, many people
As the cost of wireless service plummeted in the last year and as mobile phones became increasingly common, many people
In the last year, with the cost of wireless service plummeting, and mobile phones have become increasingly common, there are many people
With the cost of wireless service plummeting in the last year and mobile phones becoming increasingly common, many people are
While the cost of wireless service has plummeted in the last year and mobile phones are increasingly common, many people are
题目分析：
略。
选项分析：
A选项：首先，because of是介词，身后的wireless service costs plummeting in the last year的核心词为costs。但在逻辑上，很多人用电话打长途的原因是“价格下降”，而不是“价格”本身。其次，主句缺少谓语动词are，应改为many people are now using their mobile phones。
B选项：主句缺少谓语动词are，应改为many people are now using their mobile phones。
C选项：主句there are many people的核心词是“有”，这在逻辑上是不正确的。“价格下降”的结果应该是“人们打电话”，而不是“这里有人”。
D选项：Correct. 本选项在语法和逻辑上均是正确的。With the cost of wireless service plummeting in the last year是独立主格结构。
E选项：连词while的措辞有误。“价格降低”和“移动电话更加普及”是“很多人用电话”的原因，而while只能表达同时或转折的含义，因此本选项是错误的。
while转折
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