Although there are many predictions about the future, no one knows for sure ______the world would be like in 50 years.

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问题 Although there are many predictions about the future, no one knows for sure ______the world would be like in 50 years.

选项 A、how
B、that
C、which
D、what

答案D

解析 谓语动词knows后面的宾语从句中缺少一个引导词,根据句意和,结构,该引导词应在从句中作like的宾语,表示什么样,故只能用what。
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