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We must ______ known to all that smoking is harmful to heart.
A.thisB.thatC.itD.the matter
C

试题分析:句意:我们必须要让所有人知道吸烟已对心脏有害。it做形式宾语代替后面that引导的宾语从句。故选C。
考点: 考查代词的用法。
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