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    4．A lot of new technology _____ into schools to make learning more effective these years．（　　）
    A．introducedB．has introduced
    C．was introducedD．is being introduced

    分析 这些年大量的新科技被引进校园，从而让学习更有效．

    解答 答案：D
    题干中these years表达包括现在在内的时间，要用现在时态；introduce与technology之间构成动宾关系，要用被动．故选D．

    点评 现在进行时表示正在进行的动作或存在的状态．现在进行时表示动作发生的时间是"现在"，动作目前的状态是"正在进行中"当句子涉及确切的计划、明确的意图和为将来安排好的活动时，现在进行时可用于表示将来．

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