解答：选（C）It is (high / about) time (that)这个句型的意思是“现在是必须……的时候了（不能再等了）”。此句型中从句的谓语要用动词的过去式，这并不代表一般过去时态，而是对现在时态的虚拟语气。如：It is high time that you made up your mind to study English well。你该下决心把英语学好。

57. The grain output of this year is much higher than _______ of last year.

   A. that         B. such      C. which          D. what

解答：选（A）that和those常被用来代替前面提到的东西，以避免重复。代表不可数名词和单数可数名词用that；代表可数名词的复数则用those，如：The weather of Beijing is not so changeable as that of the seaside town.北京的天气不像那座海滨小城那么多变。The students in our department are fewer than those in the Foreign Language Department。我们系的学生比外语系的学生少。

58. If ______ in the fridge, the fruit can remain fresh for more than a week.

   A. keeping   B. be kept      C. kept            D. to keep

解答：选（C）因为逻辑主语the fruit与keep表达一种被动关系，所以要选过去分词kept。过去分词作条件状语时，功能相当于一个条件从句If it is kept in the fridge,…如：Heated，ice will be changed into water.（when it is heated，…）（当冰加热时，它就会变成水）

59. The criminal didn’t realize the value of freedom ____ he had lost it.

   A. if        B. as          C. while           D. until

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