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

試題分析：句意：在許多火車(chē)和汽車(chē)上，有一些專(zhuān)門(mén)的座位被事先劃定給老人。seats 與mark之間為被動(dòng)關(guān)系，故使用過(guò)去分詞。
點(diǎn)評(píng)：非謂語(yǔ)動(dòng)詞作定語(yǔ)。關(guān)鍵看它和句子主語(yǔ)之間的關(guān)系。如果是和句子主語(yǔ)之間構(gòu)成主動(dòng)關(guān)系，使用現(xiàn)在分詞，若構(gòu)成被動(dòng)關(guān)系，使用過(guò)去分詞。若表目的，使用不定式。
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