（一）非谓语动词
        1.The grey building is where the workers live,and the white one is where the spare parts_____.
        a.are producing
        b.are produced
        c.produced
        d.being produced
        2.Homework____on time will lead to better grades.
        a.done
        b.be done
        c.having done
        d.to have been done
        3.It is not unusual for workers in that region____.
        a.to be paid more than a month late
        b.to be paid later than more a month
        c.to pay later than a month more
        d.to pay late more than a month
        4.The speech ______ ，a lively discussion started.
        A) Being delivered
        B) was delivered
        G) be delivered
        D) having been delivered
        5. ______ for my illness, I would have lent him a helping hand.
        A) Not being.
        B) Had it not been
        C) Without being
        D) Not having been
        6. ______ a teacher in a university, it is necessary to have at least a master’s degree.
        A) To become
        B) Become
        C) One becomes
        D) On becoming
        
        1.b
        and 连接的两个分句应该有一致的结构，主语是备用零件是produce的接受者，所以选被动语态。
        2.a
        分词做定语修饰homework，homework是接受者，所以用过去分词表示被动。
        3.a
        本题测试不定式的被动语态，工资是被发，是动作的承受者，所以用被动语态。b的语序不正确。
        4.d
        这句是分词独立主格结构，speech是动作的承受者，所以要被动，并且发生在主句之前。
        5.b
        这句是虚拟语气的否定倒装形式。
        6.a
        不定式做目的状语。