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

A. Which B. When

C. That D. What

【答案】D

【解析】

试题分析:考查主语从句。本句中what引导主语从句并在该主语从句中做状语。that和when是不能在名词性从句中做主语的,which指特定范围之内的某一个。句意:让我惊讶的是AlphaGo击败了人类的冠军。故D正确。

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