On many trains and buses, there are some special seats ________ out for senior c
题型：不详难度：来源：
On many trains and buses, there are some special seats ________ out for senior citizens. | A．marking | B．marked | C．to mark | D．mark |
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答案
| B |
解析
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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