The computer, ______ is a 20th century invention, has created startling technolo

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问题 The computer, ______ is a 20th century invention, has created startling technological changes in the way we organize and produce information.

选项 A、that
B、which
C、what
D、it

答案 B

解析本题考查的是非限制性定语从句的用法。只有which能够引导非限制性定语从句，故选项B为正确答案。A项“that”可引导定语从句，但不能引导非限制性定语从句；C项“what”可引导名词从句，但不能引导定语从句；D项“it”不引导从句，故三个选项均排除。

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You______allthosecalculations!Wehaveacomputertodothatsortofthing.A