She opened her eyes and was about to cry out she heard her father urgently telling her to

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(答案→)A. when
B. while
C. before
D. after
解析：考查连词用法。句意：她睁开眼睛，刚要哭，这时听见爸爸急切地让她保持安静。四个选项都可用以引导时间状语从句，when 和while 表示“当…时”，before“在…前”，after“在…后”， 此处是“be about to do sth when…”结构，表示“正要……这时……”。while 引导从句时一般用延续性动词，因此最佳答案为A。