______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,本句为非限制性定语从句。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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