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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；代表墒实母词蛴?SPAN lang=EN-US>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 解答：选（D）until在否定句中，表示“直到??才”，“在??前”的意思。如：I did not go to bed until I finished my homework.直到完成作业我才上床睡觉。It is/ was not until?that?是强调句型。如：It was not until I finish my homework that I went to bed.直到完成作业我才上床睡觉。
60. Most of the people who are visiting Britain ___ about the food and the weather there.
A. are always to complain B. have always complained C. always complain C. will always complain
解答：选（C）根据who are visiting和句意来判断，该句陈述的是一般的情况，所以应选用一般现在时态