He knows several languages English, French and Japanese.
A. such as
B. for example
C. namely
D. that is
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(答案→)A. such as
B. for example
C. namely
D. that is
解析：考查词组：句意：A. such as例如，（例举例子）B. for example例如，(举例说明)C. namely 即，也就是说，D. that is也就是说，句意：他懂得几个语言，比如：英语，法语和日语。选A。