單項(xiàng)選擇題The price of commodities ()on many factors like quality, demand, supply, etc.

A.is basing
B.has based
C.is based


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1.單項(xiàng)選擇題You have made your clients() too long in the office.

A.wait
B.to wait
C.waited

2.單項(xiàng)選擇題Products are graded according to size and (). 

A.quality
B.quantity
C.qualification