单项填空试题能力层次分类分析：
1）语法理解和运用能力
动词时态
（全国一卷）
30. My mind wasn’t on what he was saying so I’m afraid you can’t have time to ____before the party.
A. was missing B. had missed C. will miss D. missed
此题考查动词时态。根据题干所提供的语境，My mind wasn’t on what he was saying用的是过去时态，说明“漏听的内容”也应该表示过去的一个客观事实。干扰最大的是B选项。如果不认真分析语境，容易误选过去完成时。正确答案为D。
（全国二卷）
25. ---Has Sam finished his homework today?
---I have no idea. He ____it this morning.
A. did B. has done C. was doing D. had done
此题语境设计非常精彩，考生如果只根据第一句的问话判断答案，A、BI 都有干扰性，尤其容易选A 选项，He did it this morning.没有上下文，单独看此句是正确的。但是认真分析对话的答语I have no idea.就只有C选项He was doing it this morning.符合对话的语境。
（北京卷）
22.---What’s that terrible noise?
---The neighbors ____ for a party.
A. have prepared B. are preparing C. prepare D. will prepare
此题根据第一句的语境判断，问的是此时此刻“噪音产生的原因”，所以选择B选项，用现在进行时态解释噪音产生的原因。
（湖北卷）
22. He kept looking at her, wondering whether he _____her somewhere.
A. saw B. has seen C. sees D. had seen
题干中的语境kept looking at暗示了出后面的动作应该使用过去完成时态，表示“…..不知在什么地方见过她。”所以答案为D。
（江苏卷）
34. Sales of CDs have greatly increased since the early 1990s, when people ____to enjoy the advantages of this new technology.
A. begin B. began C. have begun D. had begun
题干中的since the early 1990s是表示时间的关键短语，后面的定语从句有对
该短语进行了进一步说明，所以不难判断出正确答案应该是B。
了补充说明
情态动词
（全国一卷）
29. ---Isn’t that Ann’s husband over there?
---No, it _____ be him---I’m sure he doesn’t wear glasses.
A. can’t B. must not C. won’t D. may not
此题考查在特定语境中情态动词的运用。通过对所提供的语境I’m sure he doesn’t wear glasses.的理解，推断出正确选项应该是“can’t”。can’t表示一种否定的推测，考查了情态动词表示推测的基本知识，即表示否定和疑问的推测要使用can。
（上海卷）
28. Children under 12 years of age in that country ________ be under adult supervision when in a public library.
A. must B. may C. can D. need
根据题干中所提供的语境“under adult supervision when in a public library”
选择A选项。
（湖北卷）
26. ---Excuse me. Is this the right way to the Summer Palace?
---Sorry, I’m not sure. But it ____ be.
A. might B. will C. must D. can
所提供的语境I’m not sure明显说明对所说的事情把握不大，因此选择A选项might。
