On hearing the news of ________ the examination, the boy was very happy.
答案解析
解析：
答案：his having passed
解释：通过考试是主动，所以用-ing形式，排除 AB 两个被动选项, 通过考试是已经发生的事，用have done；of 后面跟的是动名词，所以D中的to pass不符合搭配。
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