20．Don't be sad．The most important thing is ______ we must learn from our mistakes and move on．（　�。�
A．howB．thatC．whatD．why

分析 不要難過，最重要的事情是我們必須從我們的錯誤中吸取教訓，然后繼續(xù)前進．

解答 答案：B
分析句子的結構可知，"we must learn from our mistakes and move on"作為完整的句子，用在了系動詞is之后，可判斷該句為表語從句；A．how 如何； B．that沒有任何意義，只起連接作用，但在表語從句中通常不能省略； C．what通常在表語從句中作主語，賓語和表語； D．why為什么；結合句意可知，該從句本身表達了完整的意思；故選B

點評 本題主要考查了表語從句的用法．做類似的題時，首先可根據(jù)句子結構（主句+系動詞+連接詞+從句），判斷該句為表語從句；其次根據(jù)句意，并結合連接詞的用法，選出正確答案．

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