With two children high school, the farmer couple have to work from morning till nightA.

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A. attended
B. being attended
C. attend
(答案→)D. attending
解析：句意：有两个孩子上高中，农民夫妇得从早到晚的劳动。这里使用with复合结构，with+宾语+宾语补足语，因为children和attend是主动关系，所以用现在分词做伴随状语，所以选D。