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
( ) is a major port of Morocco.
A．Chongjin
B．Casablanca
C．Dover
D．Durres
单项选择题
Our goods are of best ( ) and lowest ( ).
A．quality; quantity
B．quality; price
C．price; quality
D．price; quantity
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