As the cost of wireless service plummeted in the last year and as mobile phones became 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.
语法 Sentence Correction-2227
标记
正确的用户笔记
lillian4cat 2014-09-04 01:54:15
未划线部分的provide用的是一般现在时，则与As the cost of wireless service plummeted in the last year不在同一时间区间的as mobile phones became increasingly common中，became应该用一般现在时；两个as只需要用一个即可。
又是羊 2016-10-06 04:47:17
缺少谓语动词are
yolanda77 2016-11-23 10:27:33
没有谓语了！！！！！！
安安1224 2016-11-05 13:26:58
为什么要用两个as
shisu0610041 2016-09-10 21:19:50
没谓语
cicimemories 2016-07-20 06:02:23
缺主谓结构，没有are， many people 没谓语
瑞雪兆丰年 2016-07-12 18:56:57
缺少主谓成分，句子结构不完整；未划线部分的provide用的是一般现在时，则与As the cost of wireless service plummeted in the last year不在同一时间区间的as mobile phones became increasingly common中，became应该用一般现在时；两个as只需要用一个即可。
jessicachow 2016-03-28 19:10:28
未划线部分没有谓语。
hoper 2016-03-26 10:55:48
缺少主谓成分，句子结构不完整；未划线部分的provide用的是一般现在时，则与As the cost of wireless service plummeted in the last year不在同一时间区间的as mobile phones became increasingly common中，became应该用一般现在时；两个as只需要用一个即可。
蘑菇飞呀飞 2016-03-03 21:13:13
用as的话未划线的地方没有谓语
emxiaobaocai 2015-10-28 08:11:41
应该用become；many people后面缺少谓语动词。
