We have made ________ clear that we are strongly against smoking in the office.
A．thisB．thatC．itD．one
C
it的用法歸納
(1)it的基本用法：
①it可以用作人稱代詞，指代事物或上文提到過的內(nèi)容；
②在特定的環(huán)境中，也可指性別不詳、身份不明的人或嬰兒等；
③可以表示天氣、時(shí)間、距離、金錢等。
(2)it充當(dāng)形式主語或形式賓語的用法
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