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

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

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问题 ______ is known to us is that tobacco contains nicotine and other harmful products, so you should give up smoking.
选项 A、As
B、It
C、What
D、Which
答案C
解析 考查主语从句。句意：众所周知，烟草中含有尼古丁和其他有害的产品，所以你应该戒烟。此处what引导主语从句，在从句中作主语。
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