【題目】______ is known to us is that tobacco contains nicotine and other harmful products, so you should give up smoking.

A. As B. It C. What D. Which

【答案】C

【解析】試題分析：考查主語從句：句意：我們都知道的是香煙含有尼古丁和其他有害的物質(zhì)，所以你應該戒煙。第二個is是謂語，前面的是主語從句，主語從句缺少主語，用what連接主語從句，選C。

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