Lily Lucy may go with you because one of them must stay at home.A. Not only ... but also

问题补充：

Lily Lucy may go with you because one of them must stay at home.

A. Not only ... but also

B. Both ... or

C. Both ... and

D. Either ... or

答案：

A. Not only ... but also

B. Both ... or

C. Both ... and

(答案→)D. Either ... or

解析：考查主谓一致。not only ... but also，either... or，neither... nor连接名词或代词作主语时，谓语的数与最近的那个主语一致，即“就近原则”。both ... and连接主语时，谓语用复数。句意“莉莉或者露西中的一个可以和你一起去，因为其中一个必须待在家里。”根据句意可知，是“两者之一”的意思。A表示“两者都”；B搭配不当；C“两者都”；D“或者......，或者......”。故选D。