问题补充：
Mary Jack is listening to the report carefully, because they are both interested in it very much.
A. Neither; nor
B. Either; or
C. Both; and
D. Not only; but also
答案：
A. Neither; nor
B. Either; or
C. Both; and
(答案→)D. Not only; but also
解析：
试题分析: 句意：不但玛丽而且杰克在认真听报告，因为他们两个都对它非常感兴趣。 Neither...nor 既不，也不; Either...or或者……或者；Both…… and既……又；Not only……but also不但……而且；根据because they are both interested in it very much.因为他们两个都对它非常感兴趣，可知是两个人都在听报告，排除AB选项;both...and连接名词或代词时，谓语动词为复数；not only...but also遵循就近原则，根据is可知答案选选D.
