. With their son a foreign college now, the parents have some financial problems now and

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A. to attend
(答案→)B. attending
C. attended
D. having attended
解析：考查with复合结构，with+宾语+宾语补足语，因为their son和attend是主动关系，用现在分词做宾语补足语，句意：因为他们的儿子现在上大学了，父母现在时而有财政问题。选B。