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關(guān)閉窗口 請看下面的考題：
1. He is a man of few words, and seldom speaks until _________ to.
A. spoken B. speaking C. speak D. be spoken
【分析】此題容易誤選B，認(rèn)為until 是介詞，后接動詞時用動名詞形式。其實(shí)，此題應(yīng)選A，until spoken to 為 until he is spoken to 之省略。句意為“他是個沉默寡言的人，別人不同他說話，他很少同別人說話”。
2. If carefully _________, the experiment will be successful.
A. do B. does C. done D. doing
【分析】答案選C，為 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】答案選D，為 once it is begun 之省略(from m.52ysedu.com)。
五、虛擬語氣省略陷阱
在虛擬條件句中，有時可將引導(dǎo)條件從句的連詞if省略，而將從句中的were, should, had 等提到句首。如：
Were I Tom, I would refuse. 如果我是湯姆，我會拒絕。
I will go, should it be necessary. 假若有必要，我會去的。
Had it not been for the bad weather we would have arrived in time. 若不是天氣壞，我們就準(zhǔn)時到達(dá)了。
值得注意的是，若條件從句為否定句，否定詞not應(yīng)置于主語之后，而不能與were, should, had 等縮略成Weren’t, Shouldn’t, Hadn’t而置于句首。另外，有時省略if后提前的had不是助動詞。如：
Had I time, I would come. 假若我有時間，我會來的。（=If I had time…）
請看一道試題：
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】有些同學(xué)會認(rèn)為主句表示推測，從而將答案誤選為 B。其實(shí)，只要分析一下句子成分就很簡單了。四個選項(xiàng)均為謂語動詞，且第2 空所給選項(xiàng)為倒裝，這正好與虛擬語氣中省略 if 時倒裝結(jié)構(gòu)一致。由此可知該題考查與將來相反的虛擬語氣的用法。故答案選 D。
六、讓步從句省略陷阱
在由though, as引導(dǎo)的讓步狀語從句中，如果從句的表語是可數(shù)名詞單數(shù)，將名詞提前時，名詞前面的冠詞a 須省略。如：
Child as [though] he is, he knows much about the society. = Though he is a child, he knows much about the society. 盡管他還是個小孩，他對社會的了解不少。
請看兩道試題：
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】根據(jù)前面的分析，這兩道題的答案均為B。
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