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They want to develop a kind of dog-friendly food _________ will help dog owners cool down  their pets.
#43240
A
who
B
what
C
which
D
whether
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—Do you know the teacher ____ classes are interesting and exciting?— Yes, she is Mrs. Zhang.
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I have a friend _______ is training for the Olympics．　 
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The tall boy ______ you just met is my brother.
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