Although there are many predictions about the future, no one knows for sure ____

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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

解析本题测试宾语从句的引导词。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做like的宾语，表示什么样，故只能用what。

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Althoughtherearemanypredictionsaboutthefuture,nooneknowsforsure____