1. On many trains and buses，there are some special seats           for senior citizens. (mark)

在許多火車和汽車上，有一些專門被劃定給老人的座位。

1. (which / that are) marked out考查mark和非謂語動詞作后置定語的用法。mark out劃分界限，標出界限。seats與mark之間為被動關系，故使用過去分詞�，F(xiàn)在分詞和過去分詞在句中都可以作定語，但在語態(tài)和時間概念上有區(qū)別：在語態(tài)上，現(xiàn)在分詞表主動，過去分詞表被動；在時間上，現(xiàn)在分詞表示動作正在進行，而過去分詞則表示動作完成。作定語的分詞短語可以擴展為定語從句。

題目來源：高考丟分題英語 > Unit 1 A land of diversity

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