单项选择题

A．whether
B．that
C．how
D．because
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单项选择题
is the last sentence, the word they refers to ______.
A．cash and credits
B．buyers and sellers
C．return privileges
D．all the factors
单项选择题
According to the passage, which of the following is NOT a factor in the complete understanding of price
A．The quality of a product.
B．Warranties that cover a product.
C．The quantity of a product.
D．Instructions that come with a product.
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