21) In the dark street, there wasn't a single person ________ she could turn for help.

A. that B. who C. from whom D. to whom

【答案为D项。解答这道题首先要弄清楚句中的短语“turn to somebody for help”搭配，这句又是定语从句，但短语被认为割裂开之后，介词to与关系代词whom搭配在一块，根据语法规则与介词连用的关系代词必须用宾格形式。所以正确答案是to whom。】

22) Human facial expressions differ from those of animals in the degree _______ they can be controlled on purpose.

A. With which B. to which C. of which D. for which

【答案为B项。这道题与上面那道题的思路是一致的，短语be controlled to，也是被割裂开，与关系代词连用。这儿指的是“控制到….程度”，故只有to which符合题意。】

应试技巧三：明确省略成分, 补全句子看清真面目

试题命制时，为使语言生动，自然、简洁，所以常常采用这种省略形式。解答这类题，首先要求考生弄懂句意，再根据所学语法知识将句子还原或补全，有助于考生快速地掌握句子的意思。不过这类现象多为同源主语的省略。

23) ________ with the size of the whole earth, the biggest ocean does not seem big at all.

A. Compare B. When comparing C. Comparing D. When compared

【答案为D项。本题考查when之后非谓语动词用法。对when用法的判断是解题关键。when(或其它词，如：while， since，once等)引导状语从句时，若从句主语和主句主语相同，且从句谓语部分含有be时，可把从句主语和be同时省略。本题干中在when后省略了it is。即when it is compared with the size of the whole earth...】

24) The research is so designed that once ______ nothing can be done to change it.

A. begins B. having begun C. beginning D. begun

【答案为D项。本题once之后省略了it is, 显然, 此处应用被动语态。】

25) We all know that, __________, the situation will grow worse.

A. not if dealt carefully with B. if not carefully dealt with

C. if dealt not carefully with D. not if carefully dealt with

【答案为B项。if后接的省略句，其实它的完整结构是if it is not carefully dealt with。显然，选项的内容省略了it is, 而剩余部分就是正确答案。】

应试技巧四：巧用结构分析句子，理顺还原本来面目

有些语法填空题的句子结构较复杂，迷惑性大，稍有疏忽，必定会受到干扰项的干扰，这时就需要耐心和细心地分析句子，弄清结构，再对照选项进行甄别选出正确选项。

26) You can’t imagine what difficulty we had ________ home in the snowstorm.

A. walked B. walk C. to walk D. walking

【答案为D项。Imagine后面的宾语从句是what引导的感叹句，其正常语序为：We had difficulty ________ home in the snowstorm. 其实这句就是考查have difficulty/trouble (in) doing something句型结构。】

应试技巧五：语境背景要弄清，细心分析究根源

有些语法填空题常常在语境中考查考生对语言结构和语言知识的考查，这类题型是近年来常考题。这就要求考生要针对语境做细致的分析，以语境为切入点对测试题进行思考，分析，甄别和抉择。

27) —Bill, if it doesn’t rain, we can go straight on and spend more time in Vienna.

— ___________ I just want to hear Mozart.

A. Well done! B. No problem. C. That’s great! D. That’s it.

【答案为C。That’s great!意思是“太好了!太棒了!”。根据对话材料，我们I just want to her Mozart, 可以断定出说话者本人自己想去听莫扎特的音乐会，当听到对方说可能要去维也纳时，心中不禁大喜。Well done!的意思是“干得好!”problem意思是“没问题。”That’s it. 表示为“做得对!就是这样!”】

28) -Excuse me. Is this the right way to the Summer Palace?

-Sorry, I am not sure. But it _____ be.

A. might B. will C. must D. can

【答案为A。根据答语中的I am not sure, 就是一个重要的信息，表明说话者把握不大。根据语法规则，但没什么把握是或不确定时，一般用情态动词may或might。】

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