He knows several languages he knows English and Japanese.A. such asB. for exampleC. tha

问题补充：

He knows several languages, , he knows English and Japanese.

A. such as

B. for example

C. that is

D. for an example

答案：

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。