单项选择题

What's the basis of your belief ( ) the product is safe

A．why
B．that
C．how
D．/
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单项选择题
Our goods are of best ( ) and lowest ( ).
A．quality; quantity
B．quality; price
C．price; quality
D．price; quantity
单项选择题
If one side fails to observe the contract, the other side ( ) cancel it.
A．be entitled to
B．entitled to
C．being entitled to
D．is entitled to
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