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

发布时间：2020-08-17 06:40:49

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

网友回答

A. this
B. that
(答案→)C. it
D. the matter
解析：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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