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

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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