15．They arrived home thanexpected （expect）．

分析 他們到家比預(yù)期的早．

解答 答案是expected．本題考查比較狀語從句的省略；該句完整的表達(dá)為"They arrived home earlier than they are expected"；狀語從句省略的規(guī)則是"同時(shí)省去與主句相同的主語和be動(dòng)詞"；本題中省略了they are，故答案是expected．

點(diǎn)評(píng) 單詞填空必須在對(duì)語境整體理解的基礎(chǔ)上抓住指向答案的關(guān)鍵線索、固定句型或搭配等，同時(shí)注意所選詞的形式變化．

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