答案B 一般情况而言,hundred,thousand,million,billion等表示数量的词,由两种用法：1）无论他们前面有多少的数词,这几动词后都不加s,2）hundreds of等形式前面不能加确切数字,可以加表示不确定的数,故答案选B 查看原帖>>
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_____ people in the world are sending are receiving e-mails
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