At the beginning of class.the noise of desks could be heard outside the classroom. A.opened and closed B.to be opened and closed C.being opened and closed D.to open and close 答案 C 解析 本题考查非谓语动词作定语.过去分词作定语表完成.被动,不定式作定语表将来,现在分词作定语表示正在进行.本题题意:开始上课时.在教室外面就能听到开关课桌的声音.由句意可知表示开关课桌的动作正在进行.因此用现在分词作定语. 【
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