问题标题：
【wehaven'theardfromJoneforalongtime.--whatdoyousuppose___toher.以下选哪个答案washappeningB.ishappenedC.hashappenedD.hadhappened.这是被动语态的单项选择题】
问题描述：
wehaven'theardfromJoneforalongtime.--whatdoyousuppose___toher.以下选哪个答案
washappeningB.ishappenedC.hashappenedD.hadhappened.这是被动语态的单项选择题
贺宁回答：
CHAPPEN不及物无被动语态STHHAPPENTOSB,某人发生了某事
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