China is no longer ______ it used to be.

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问题 China is no longer ______ it used to be.

选项 A、what
B、of what
C、if
D、which

答案A

解析 根据空当后出现谓语动词可知,空当及后面为一表语从句。空当处缺少一连接代词,因连接代词在从句中作be的表语,因此,A为正确选择。
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