______ is known to all, too much smoking will cause lung cancer.A、ThatB、ItC、As

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问题 ______ is known to all, too much smoking will cause lung cancer.

选项 A、That
B、It
C、As
D、What

答案 C

解析固定用法as is known to all意为“众所周知”。本句的意思是：“众所周知，吸烟过多会引起肺癌。”B用于it is known to all that...句型。

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众所周知，吸烟有害健康。Asiswellknown,smokingisbadforhealth.