D

解析試題分析:句意:毫無(wú)疑問他明天回來。但是我懷疑他是否會(huì)按時(shí)到這。There is no doubt that. ........是毫無(wú)疑問的。if/whether 是否。
考點(diǎn):考查連詞的用法。

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