问题补充：
Kitty Cathy is going with you because one of them must stay at home.
A. Not only; but also
B. Neither; nor
C. Both; and
D. Either; or
答案：
A. Not only; but also
B. Neither; nor
C. Both; and
(答案→)D. Either; or
解析：此题重点考查四个短语的含义及其基本用法。Not only…but also…表示不仅…而且；neither …nor表示既不…也不；both …and…表示两者都怎样either…or表示两者任何一个，或者…或者；其中not only…but also和both…and连接两个主语时，谓语动词要用复数；neither…nor…和either…or…连接两个主语时谓语动词要用单数形式。
