12．---Peter ______a great world-famous pianist．
---Yes，but it is a pity that he lost his left arm in an electrical shock when he was 20．（　　）
A．should becomeB．must have become
C．would becomeD．would have become

分析 --彼得本來應(yīng)該成為一位世界聞名的鋼琴家．
--是的，但遺憾的是他20歲時在一次電擊中失去了左臂．

解答 D 考查虛擬語氣．根據(jù)答語，可以知道他在20歲的時候失去了胳膊，可見上文中成為鋼琴家不是真實，應(yīng)該是虛擬語氣"本來是可以成為一名鋼琴家的"，是對過去的虛擬，所以用情態(tài)動詞+have done，must不能引導虛擬語氣，故答案選D．

點評 虛擬語氣在高考命題中不是重點，但是難點．考點常集中在含蓄條件句以及主語、賓語從句等特定句型中虛擬語氣的使用上，因此考生應(yīng)熟練掌握含蓄條件句中主從句的時態(tài)要求以及一些典型句型中虛擬語氣的具體形式．

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