China Business Daily reported the 60% discounts on some Beijing-shanghai flights have now slipped back to 20% _______ one day in advance.

A.when books       B.when to book      C.when booking      D.when booked

 

【答案】

D

【解析】

試題分析:考查狀語從句的省略。當(dāng)狀語從句的主語與主句的主語一致,且狀語從句中有系動詞be的時候,可以把狀語從句的主語和be動詞一起省略。本題在when和booked之間省略了it is;句意:如果提前一天預(yù)訂,從北京到上海的機票折扣從百分之60下降到百分之20.故D正確。

考點:考查狀語從句的省略

點評:當(dāng)狀語從句的主語與主句的主語一致,且狀語從句中有系動詞be的時候,可以把狀語從句的主語和be動詞一起省略。如果狀語從句中有it is的時候,it is 也可以省略。

 

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