______ is known to us is that tobacco contains nicotine and other harmful products, so you should give up smoking.
A．AsB．ItC．WhatD．Which
C

試題分析：考查主語(yǔ)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(yīng)該戒煙。第二個(gè)is是謂語(yǔ)，前面的是主語(yǔ)從句，主語(yǔ)從句缺少主語(yǔ)，用what連接主語(yǔ)從句，選C。
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