Question

We must ______ known to all that smoking is harmful to hear

We must ______ known to all that smoking is harmful to heart. A．this B．that C．it D．the matter

Answer 1

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。