After two years he received the certificate of the college for ______ in chemistry.

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问题 After two years he received the certificate of the college for ______ in chemistry.

选项 A、proficiency
B、diversion
C、immersion
D、involvement

答案A

解析名词辨义。这四个选项都是名词形式，proficiency表示“熟练，精通(常跟介词in连用)”；di version表示“转移，转换，牵制”；immersion意指“沉浸，浸没；专心，陷入”；involvement表示“连累，包含”。根据句意，因为精通化学知识，他才拿到学历证书，所以A)项符合题目要求。

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大学英语六级

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After two years he received the certificate of the college for ______ in chemistry.

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