单项选择题
Having been working in logistics for 3 years， he is more than（） he used to be.
A.proud
B.brave
C.confident
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Thepriceofcommodities（）onmanyfactorslikequality，demand，supply，etc.
A.is basing
B.has based
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Youhavemadeyourclients（）toolongintheoffice.
A.wait
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Productsaregradedaccordingtosizeand（）.
A.quality
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C.qualification
