30.(05山东24)
It was some time we realized the truth.
A.when B.until C.since D.before
答案 D
解析 句意为：过了一段时间之后我们才认识到真相。before意为“……之后才……”。
29.(06四川35)
-Why didn’t you tell him about the meeting?
-He rushed out of the room I could say a word.
A.before B.until C.when D.after
答案 A
解析 答语意为：他在我说话之前就跑出了房子。
28.(06广东26)
Jenny was very sad over the loss of the photos she had shot at Canada， this was a memory she especially treasured.
A.as B.if C.when D.where
解析 本题考查原因状语从句，用as，句意为：……因为这是她特珍惜的一段记忆。其他三项都不表示原因。
27.(06江苏35)
We haven’t settled the question of it is necessary for him to study abroad.
A.if B.where C.whether D.that
答案 C
解析 此题考查宾语从句。介词of后为一宾语从句，故A项可排除；if不能引导介词后的宾语从句；再由句子结构判断此处不缺状语，故排除B项。由句意“他是否有必要去国外学习”可判定答案为C项。
26.(06江苏24)
This new model of car is so expensive that it is the reach of those with average incomes. A.over B.within C.beyond D.below
解析 此题考查介词的用法。over表示数目、程度超过，多于；within在……之内；beyond(表示范围、限度)超出；below在……以下。此处指“这种新型的车太贵了，它超出了收入是一般情况的人的购买能力(范围)”。beyond the reach超出……范围。
25.(06湖南25)
Fred，who had expected how it would go with his daughter，had a great worry his mind.
A.on B.in C.with D.at
解析 本题考查介词的用法。on one’s mind意为“某人有心事，担心”；如：You look worried，Sarah.Is there anything on your mind?萨拉，你看起来很焦虑。有什么心事吗？in one’s mind在某人心里；with与at不与mind搭配。根据句意，A项正确。
24.(06福建23)
Sorry，Madam.You’d better come tomorrow because it’s the visiting hours.
A.during B.at C.beyond D.before
解析 考查介词的用法。beyond(时间)晚于，迟于。句意为：对不起，女士，你最好明天来，因为已经过了开放期了。
23.(06辽宁28)
People have always been curious how living things on the earth exactly began.
A.in B.at C.of D.about
解析 be curious about sth.对某事物感到好奇的。
22.(06北京22)
- When do we need to pay the balance?
- September 30.
A.In B.By C.During D.Within
答案 B
解析 by不迟于(某时)，在……之前。the balance余欠之钱。
21.(06湖南27)
achievement，last week’s ministerial meeting of the WTO here earned a low，though not failing，grade.
A.In terms of B.In case of C.As a result of D.In face of
解析 本题考查介词短语的用法。in terms of意为按照，从……方面来说；in case of万一，以防；as a result of由于……；in face of 面临，不顾。根据句意，A项正确。