It was impolite of him without good－bye
A. to leave; saying
Bleaving; to say
Cto leave; to say
D. leaving; saying
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(答案→)A. to leave; saying
B. leaving; to say
C. to leave; to say
D. leaving; saying
解析：考查形式主语和动名词用法。本题的it是形式主语，真正的主语是不定式短语to leave without saying good-bye; without是介词，后面要使用动名词的形式。句意：没有说再见就离开他真是没有礼貌。根据句意说明A正确。