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  3. ______ is known to all, English is one of the most widely used languages in international communication.

______ is known to all, English is one of the most widely used languages in international communication.

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问题 ______ is known to all, English is one of the most widely used languages in international communication.
选项 A、As
B、Which
C、That
D、Who
答案A
解析 分析句子结构可知，本句包含一个非限制性定语从句。as和which均可以引导非限制性定语从句，指代整个句子。as引导的非限制性定语从句可以放在主句之前，或者主句之后，甚至可以切割主句；which引导的非限制性定语从句只能放在主句之后。另外，as引导的非限制性定语从句中有很多可以当作固定搭配，如as is known to all，as is often the case，as is mentioned above，as often happens等。故选A。
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