A may be
这句话缺少谓语动词,所以用情态动词+动词原形 做谓语.
B只是副词 C is不是原形 D.缺少动词原形
By the year 2012,the world's population__seven billion,A may be B maybe C may is D may,
By the year 2012,the world's population__seven billion,A may be B maybe C may is D may,
英语人气：316 ℃时间：2020-04-16 09:34:39
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