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
网友回答
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。