John has no idea ______ this dog has been following him all the way.
what
when
where
why
句意:约翰不知道为什么这条狗一路上跟着他。分析句子成分可知。空格后是同位语从句,作idea的同位语。空格处为同位语从句的引导词,根据句意,故选D。
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