Although ______ happened in that developed country sounds like science fiction,

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问题 Although ______ happened in that developed country sounds like science fiction, it could occur elsewhere in the world.

选项 A、which
B、what
C、how
D、it

答案 B

解析本题考查的是主语从句。what可以引导主语从句，本句中what引导的主语从句作整个句子分句的主语，同时what也是主语从句动词happen的主语。其他选项不能引导主语从句。

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