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Her remarks left me wondering ___ she could have changed so suddenly.
答案是how，想问一下老师，如此可以用whether吗？
her remarks是主语 left 谓语 me是宾语 wondering how she could have。。。。是目前分词接宾语做了me的宾补。
could have done 常常用否定疑问句表示对过去事实的质疑和不相信。how could she have changed so suddenly？ 这个特殊疑问句放在从句中自然用了陈述语序。 就变成了 how she could。。。。 whether因该不可以引疑问句吧
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