请看下面的考题：
1. He is a man of few words, and seldom speaks until _________ to.
A. spoken B. speaking C. speak D. be spoken
【分析】此题容易误选B，认为until 是介词，后接动词时用动名词形式。其实，此题应选A，until spoken to 为 until he is spoken to 之省略。句意为“他是个沉默寡言的人，别人不同他说话，他很少同别人说话”。
2. If carefully _________, the experiment will be successful.
A. do B. does C. done D. doing
【分析】答案选C，为 if it is carefully done 之省略。
3. The research is so designed that once _________ nothing can be done to change it.
A. begins B. having begun C. beginning D. begun
【分析】答案选D，为 once it is begun 之省略(from www.hxen.com)。
五、虚拟语气省略陷阱
在虚拟条件句中，有时可将引导条件从句的连词if省略，而将从句中的were, should, had 等提到句首。如：
Were I Tom, I would refuse. 如果我是汤姆，我会拒绝。
I will go, should it be necessary. 假若有必要，我会去的。
Had it not been for the bad weather we would have arrived in time. 若不是天气坏，我们就准时到达了。
值得注意的是，若条件从句为否定句，否定词not应置于主语之后，而不能与were, should, had 等缩略成Weren’t, Shouldn’t, Hadn’t而置于句首。另外，有时省略if后提前的had不是助动词。如：
Had I time, I would come. 假若我有时间，我会来的。（=If I had time…）
请看一道试题：
It _________ very silly to argue any more against each other about it _________ true.
A. will be; could that be B. must be; could that be
C. should be; was that to be D. would be; should that be
【分析】有些同学会认为主句表示推测，从而将答案误选为 B。其实，只要分析一下句子成分就很简单了。四个选项均为谓语动词，且第2 空所给选项为倒装，这正好与虚拟语气中省略 if 时倒装结构一致。由此可知该题考查与将来相反的虚拟语气的用法。故答案选 D。
六、让步从句省略陷阱
在由though, as引导的让步状语从句中，如果从句的表语是可数名词单数，将名词提前时，名词前面的冠词a 须省略。如：
Child as [though] he is, he knows much about the society. = Though he is a child, he knows much about the society. 尽管他还是个小孩，他对社会的了解不少。
请看两道试题：
1. _________ as it is, it can understand you.
A. A dog B. Dog C. Dogs D. The dog
2. _________, he talks a lot about his favorite singers after class.
A. A quiet student as he may be B. Quiet student as he may be
C. Be a quiet student as he may D. Quiet as he may be a student
【分析】根据前面的分析，这两道题的答案均为B。
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