His report was so exciting that it wasinterrupted by applause（掌声）.A. constantlyB. constant

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(答案→)A. constantly
B. constant
C. seldom
D. never
解析：词义辨析。     A.副词， 不断地；时常的 B.形容词，不变的  C.副词，很少          D.从未；决不。句意：这个报告时如此振奋人心，它不断被掌声打断。副词修饰interrupted，故选A。