_____ at his knowledge, all the students showed their respect for their teacher.
A.Amazed
B.Being amazed
C.Amazing
D.Having amazed
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A解析试题分析：考查形容词用法。固定词组be amazed at…对…感到惊讶；本题amazed at…是对主语all the students进行修饰的。句意：对于他的知识感到很惊讶，所有的学生都很尊敬他们的老师。故A正确。考点：考查形容词辨析点评：本题是用形容词短语对句子主语的情况进行说明。要注意过去分词转换的形容词的用法。