三个都有语法错误,
这个句子需要定语形容词
正确的形式是
not having heard from his parents ...
这种 “因-果”句型叙述的“因” （没获得父母的信息）已结束,
例句：
having eaten,I feel full
not having eaten,I feel hungry
【 】 from his parents for a long time he was worried about th
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