With two sons in Afghanistan John and Susie Mayes are working extra hard this year to ma

问题补充：

With two sons in Afghanistan, John and Susie Mayes are working extra hard this year to make sure their grandchildren have a great Christmas.

A. to serve

B. serving

C. having served

D. served

答案：

A. to serve

(答案→)B. serving

C. having served

D. served

解析：考查with复合结构；with的复合结构为：with的复合结构为：with+宾语+宾语补足语；宾语补足语可以是名词，代词，形容词，副词，现在分词，过去分词，也可以是不定式。对宾语的情况进行补充说明。本题的two sons与动词serve构成主动关系，故使用现在分词。不定式表示主动，但是也表示将来。句意：有两个儿子在阿富汗服役，John和Susie Mayes正在努力加班报纸他们的孙子女们有一个很棒的圣诞节。故B正确。