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On many trains and buses, there are some special seats ________ out for senior citizens.
A.markingB.markedC.to mark D.mark
B

试题分析:句意:在许多火车和汽车上,有一些专门的座位被事先划定给老人。seats 与mark之间为被动关系,故使用过去分词。
点评:非谓语动词作定语。关键看它和句子主语之间的关系。如果是和句子主语之间构成主动关系,使用现在分词,若构成被动关系,使用过去分词。若表目的,使用不定式。
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