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They want to develop a kind of dog-friendly food _________ will help dog owners cool down  their pets.
A．whoB．whatC．whichD．whether
C
考查定語從句的引導詞。句意“他們想研制一種對狗有好處的狗糧，這種狗糧會幫助狗的主人安定他們的寵物�！毕刃性~food指物，排除who；what不能引導定語從句；which指物。故選C。
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