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问题:

[单选] Your firm has been recommended to us by AMK company, () we have done business for many years.

A . with whom
B . with who
C . whom
D . who

避免催化剂损坏,在加氢装置停工过程必须对反应系统进行() 恒温脱氢。 再生烧焦。 热氢带油。 硫化恒温。 凸版印刷的干燥方式是();胶印的干燥方式是();凹印的干燥方式是()。 如何鉴定是否是游客? 人民警察违反规定使用武器、警械,尚不构成犯罪的,应当依法给予行政处罚。() “学点语法”中的“语法”指客观存在的()。 Your firm has been recommended to us by AMK company, () we have done business for many years.
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