We must ______ known to all that smoking is harmful to heart.A．thisB．thatC．itD．t_刷题宝

题干

We must ______ known to all that smoking is harmful to heart.

A．this

B．that

C．it

D．the matter

上一题下一题 0.64难度单项选择更新时间:2013-12-02 03:22:47

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