20．It is vital that our school________ students to use computer technology．（　　）
A．may teachB．must teachC．teachD．is teaching

分析 我們學(xué)校教學(xué)生使用電腦技術(shù)是至關(guān)重要的．

解答 答案是C．本題考查虛擬語氣．題干中考查句型"It be+adj （vital，necessary，important，natural…）+that"中，that 從句中的動詞往往用"（should）+do"，故答案選C．

點評 在掌握虛擬語氣的規(guī)則的基礎(chǔ)上，判斷題干屬于什么類型的虛擬，然后根據(jù)語境，選用恰當(dāng)?shù)膭釉~形式表達虛擬．

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