He knows several languages, , he knows English and Japanese.
A. such as
B. for example
C. that is
D. for an example
网友回答
A. such as
(答案→)B. for example
C. that is
D. for an example
解析：句意：他懂得好几种语言，比如他懂得英语和日语。such as 例如，不用逗号；that is也就是说。for an example不表例如，例如也可以用take…for example。故选B。