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 這些年大量的新科技被引進(jìn)校園，從而讓學(xué)習(xí)更有效．

解答 答案：D
題干中these years表達(dá)包括現(xiàn)在在內(nèi)的時間，要用現(xiàn)在時態(tài)；introduce與technology之間構(gòu)成動賓關(guān)系，要用被動．故選D．

點(diǎn)評 現(xiàn)在進(jìn)行時表示正在進(jìn)行的動作或存在的狀態(tài)．現(xiàn)在進(jìn)行時表示動作發(fā)生的時間是"現(xiàn)在"，動作目前的狀態(tài)是"正在進(jìn)行中"當(dāng)句子涉及確切的計(jì)劃、明確的意圖和為將來安排好的活動時，現(xiàn)在進(jìn)行時可用于表示將來．

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