这是宾语从句.关键词是DOUBT.AS TO （== ABOUT) 引出了后面的句子WHETHER HE WILL FINISH THE TASK IN A SHORT TIME.这个句子作AS TO 介词短语的宾语.其实,AS TO 这两个字可以省略.DOUBT 的具体内容就是WHETHER HE W...
there exists a certain doubt among the workers as to whether
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there were a certain doubt英语高手来
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1.There is still some doubt (whether) the story is ture.