问题补充：
With a lot of difficulties , they went to the seashore and had a good rest.
A. settled
B. settling
C. to settle
D. being settled
答案：
(答案→)A. settled
B. settling
C. to settle
D. being settled
解析：非谓语动词。根据主句可知：他们的困难已经解决，故去海边玩。所以用过去分词表示被动和动作的完成。
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