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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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You have made your clients（） too long in the office.

A.wait
B.to wait
C.waited

單項(xiàng)選擇題

Products are graded according to size and （）.

A.quality
B.quantity
C.qualification

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