问题

I _____ it as a basic principle ofthe company that suppliers of raw materials should be given a fair price fortheir products
A:what it is about Mary that
B:that is it abut Mary what
C:what is it about Mary that
D:that is about Mary what
B:that is it abut Mary what
C:what is it about Mary that
D:that is about Mary what
正确答案是:
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