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 Heisveryhumorous,whilehisbrotherisratherserious.Thatis...

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 Heisveryhumorous,whilehisbrotherisratherserious.Thatis...

 He is very humorous, while his brother is rather serious. That is __ their difference lies.

A. why              B. where          C. how            D. when

【回答】

AAC

知識點:連詞

題型:選擇題

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