【 】 from his parents for a long time he was worried about th
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1个回答

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

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