问题补充：
With two children middle school, the parents are working hard.
A. attended
B. being attended
C. having attended
D. attending
答案：
A. attended
B. being attended
C. having attended
(答案→)D. attending
解析：考查with复合结构。考查with复合结构：with+宾语+宾语补足语。本题children与attend之间构成主动关系，故使用现在分词。排除AB。C项表示已经完成，而本题并没有已经完成的意思。故D正确。
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