It was funny that when Mary began to weep sadly. A. praisingB. praisedC. to praiseD. havi

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A. praising
B. praised
C. to praise
D. having praised
解析：考查状语从句的省略式，当主从句主语一致的时候，可以省略从句的主语和be动词，when praised=when Mary was praised，句意：很滑稽当玛丽被表扬的时候开始难过的哭泣。选B。