Four-fifths of the crop ______. 
A.a(chǎn)re ruinedB.was ruinedC.were ruinedD.have been ruined
B

試題分析:考察主謂一致。當(dāng)分?jǐn)?shù)百分?jǐn)?shù)做句子主語的時候,謂語動詞的單復(fù)數(shù)要根據(jù)分?jǐn)?shù)百分?jǐn)?shù)后的名詞。如果名詞是不可數(shù)名詞孩子可數(shù)名詞單數(shù)形式,謂語動詞用單數(shù),如果是可數(shù)名詞復(fù)數(shù)形式,謂語動詞使用復(fù)數(shù)形式。本題后面的名詞the crop是可數(shù)名詞單數(shù),故謂語動詞使用單數(shù)形式。故B正確。
點評:1. 單數(shù)名詞(代詞),不可數(shù)名詞作主語時,謂語用單數(shù)形式,復(fù)數(shù)名詞(代詞)作主語,謂語用復(fù)數(shù)形式。
The desk is Tom’s.    這張桌子是湯姆的。
Some water is in the bottle.   一些水在瓶子里。
The students are playing football on the playground.  這些學(xué)生正在操場上踢足球。
2. many a+單數(shù)名詞作主語,意義雖為“許多”,但謂語要用單數(shù)形式。
Many a student has been to Shanghai. 許多學(xué)生到過上海。
3. more than one+單數(shù)名詞作主語,謂語用單數(shù)。
More than one student has ever been to Beijing.    不止一個學(xué)生曾經(jīng)去過北京。
4. 表示時間,價格,重量,數(shù)目,長度,數(shù)學(xué)運算等的詞或短語作主語時,這些通常作一個整體概念,謂語用單數(shù)形式。例如:
Two months is a long holiday.   兩個月是一個長假。
Twenty pounds isn’t so heavy.    2 0英鎊并不太重。
Ten miles isn’t a long distance.   1 0英里并不是一段很長的距離。
Five minus four is one.             5減4等于1。
5. 主語是each/every+單數(shù)名詞+and(each/every)+單數(shù)名詞時,謂語動詞用單數(shù)。
Each boy and each girl has got a seat.   每個男孩和女孩都有一個座位。
Every man and every woman is at work.  每個男人和女人都在工作。
6. one and a half+復(fù)數(shù)名詞作主語,謂語動詞用單數(shù)形式。
One and a half hours is enough.  一個半小時足夠了。
7. 動詞不定式,動名詞作主語時,謂語動詞用單數(shù)形式。
To see is to believe   眼見為實。
Doing eye exercises is good for your eyes.
做眼睛保健操對你的眼睛十分有益。因此在實際操練中要指導(dǎo)學(xué)法,掌握基本用法,注意變化就能突破
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