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(guò)，最重要的事情是我們必須從我們的錯(cuò)誤中吸取教訓(xùn)，然后繼續(xù)前進(jìn)．

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

點(diǎn)評(píng) 本題主要考查了表語(yǔ)從句的用法．做類(lèi)似的題時(shí)，首先可根據(jù)句子結(jié)構(gòu)（主句+系動(dòng)詞+連接詞+從句），判斷該句為表語(yǔ)從句；其次根據(jù)句意，并結(jié)合連接詞的用法，選出正確答案．

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