时态问题？？？

mapleflying · 发表于 2005-9-11 21:15:00

While the cost of wireless service has plummeted in the last yearand mobile phones are increasingly common, many people are

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.

这句话中划线部分的时态有没有问题啊？完成时可以用在这种时间状语前面吗

vickiyan · 发表于 2005-9-11 22:38:00

能说一下这段话的来源吗？是挺奇怪的

mapleflying · 发表于 2005-9-11 23:43:00

GWD9-3

mapleflying · 发表于 2005-9-12 21:40:00

能解释一下吗

mapleflying · 发表于 2005-9-13 22:28:00

怎么都不说话了

三脚猫 · 发表于 2005-9-15 09:20:00

楼主参考 http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=132105&page=2

时态问题？？？

时态问题？？？

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