He knows English French. But he’s very good at Japanese.A. either orB. both andC. neit

问题补充：

He knows English French. But he’s very good at Japanese.

A. either, or

B. both, and

C. neither, nor

D. not, but

答案：

A. either, or

B. both, and

(答案→)C. neither, nor

D. not, but

解析：neither, nor既不是……也不是；either, or要么……要么；not only, but also不仅……而且。Not……but不是……而是。句意:他既不懂英语也不懂法语。但是他很擅长日语。结合语境可知选C。