It is the idea____smiles can get rid of cold ____has been proved by the researchers many times.  
A．which; whichB．that; thatC．that; whichD．which; that
B
第一that引導(dǎo)的同位語從句; 第二個(gè)that為強(qiáng)調(diào)句型的引導(dǎo)詞that。
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