_________of the goods,we discovered that they were inferior in quality to the sample.
A、After exam
B、By examination
C、Examination
D、Upon examination
【正确答案】：D
【题目解析】：[解析]句意：一检查货物，我们就发现这批货物的质量比样品质量差。on/upon +动名词+名词或on/ upon +名词表示“一 就 ”，故D
_________of the goods,we discovered that they were inferior in q
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