Lily Lucy may go out for a walk with you because one of them must do the dishes at home.

问题补充：

Lily Lucy may go out for a walk with you because one of them must do the dishes 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：本题的后半句表示的含义是其中有一个人必须在家里洗碗盘，所以前半句的含义是莉莉和露西两个人只能有一个人和你出去散步，either ……or表示“要么……要么”的含义，表示的是两者只能取其一，故本题选D。