4._______ astonishes us is that AlphaGo defeated the human champion.( 。
A.WhichB.WhenC.ThatD.What

分析 讓我們驚訝的是阿爾法圍棋(智能程序)居然打敗了人類冠軍.

解答 答案:D 題干所給的句子中,前面的astonishes us 是謂語結(jié)構(gòu)(動(dòng)詞用了三單形式);后面接了is that AlphaGo defeated the human champion系表結(jié)構(gòu),說明前面的部分是充當(dāng)了is的主語,是一個(gè)主語從句;主語從句中astonishes缺少主語,要用連接代詞.故選D.

點(diǎn)評(píng) 在句子中起名詞作用的各種從句統(tǒng)稱為名詞性從句.根據(jù)它們?cè)诰渲械恼Z法作用,這類從句又可分為主語從句、同位語從句、表語從句和賓語從句. 本題中what在主語從句中起連接作用,同時(shí)又充當(dāng)了從句的主語.

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