I asked both Mary and Lucy to my birthday party but of them came .A. both B. all C. neith

问题补充：

I asked both Mary and Lucy to my birthday party, but of them came .

A. both B. all C. neither

答案：

解析：根据前一句，可知有两个人，又根据but 可知两个人都没来，故选C，表示两者都不。