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    精英家教网 > 高中英语 > 题目详情
    China Business Daily reported the 60% discounts on some Beijing-shanghai flights have now slipped back to 20% _______ one day in advance.
    A．when booksB．when to bookC．when bookingD．when booked
    D

    试题分析：考查状语从句的省略。当状语从句的主语与主句的主语一致，且状语从句中有系动词be的时候，可以把状语从句的主语和be动词一起省略。本题在when和booked之间省略了it is；句意：如果提前一天预订，从北京到上海的机票折扣从百分之60下降到百分之20.故D正确。
    点评：当状语从句的主语与主句的主语一致，且状语从句中有系动词be的时候，可以把状语从句的主语和be动词一起省略。如果状语从句中有it is的时候，it is 也可以省略。
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