I can make myself in French， but I’m not fluent.
A. understood
B. understand
C. to understand
D. being understood
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(答案→)A. understood
B. understand
C. to understand
D. being understood
解析：make oneself understood 为固定短语，意为“使自己的说话被人听懂”，由于 oneself 与 understand 之间为被动关系，所以 understand 要用过去分词。