问题补充:
New York London are two of the largest cities in the world.
A. Either; or
B. Both; and
C. Neither; nor
D. Not only; but also
答案:
A. Either; or
(答案→)B. Both; and
C. Neither; nor
D. Not only; but also
解析:
根据谓语动词判断,应该是both …and..结构。其它几个都是就近一致原则,该用单数。