_____on the grass _____singing and laughing.A.Seated ; is some studentsB.Seated ; are some studentsC.Sitting ; is some studentsD.Sitting ; some students are
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B解析试题分析：句意：坐在草地上，这些学生又是唱又是笑。这是倒装句，主语是some students所以谓语动词用复数，正常的语序是sb be seated on the grass singing and laughing.故选B。考点：考查倒装及主谓一致的用法。
点评：本题难度适中。倒装及主谓一致是高中阶段的重要的两项语法项目，它们的各种情况比较多，需要考生牢记它们的用法，但是把两者结合一起来考查更增加了试题的难度。即学即练：At the meeting place of the Yangtze River and the Jialing River ______，one of the ten largest cities in China.A．lies Chongqing B．Chongqing liesC．does lie Chongqing D．does Chongqing lie解析：A。表示方位的介词短语at the meeting place of the Yangtze River and the Jialing River位于句首，故此处应该用全部倒装。