【題目】_______ astonishes us is that AlphaGo defeated the human champion.

A. Which B. When

C. That D. What

【答案】D

【解析】

試題分析：考查主語從句。本句中what引導主語從句并在該主語從句中做狀語。that和when是不能在名詞性從句中做主語的，which指特定范圍之內(nèi)的某一個。句意：讓我驚訝的是AlphaGo擊敗了人類的冠軍。故D正確。

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