their son away to college they got more room in the house.A. WithB. BecauseC. ForD. As

问题补充：

their son away to college, they got more room in the house.

A. With

B. Because

C. For

D. As

答案：

(答案→)A. With

B. Because

C. For

D. As

解析：因为逗号后是句子，逗号前又没有谓语动词，故不能用连词，BCD都是连词，故选A。with介词。