I'm afraid that I can't make myself be cause of my poor English. A. understand B. unders

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A. understand
B. understanding
C. to understand
(答案→)D. understood
解析：考查宾语补足语用法。动词make的宾语是myself，myself与动词understand之间构成被动关系，故使用过去分词表示被动。句意：因为我的英语很糟糕，恐怕我不能让自己被理解。故D正确。