If I ______ about this computer program, a hage amount of time and energy would have been saved.
A．knowB．knewC．had known D．have known
C

試題分析：考查虛擬語(yǔ)氣：句意：如果我知道這電腦程序，大量的時(shí)間和精力就會(huì)被節(jié)省下來(lái)，從句意和主句的would have done可知是和過去相反的虛擬語(yǔ)氣，if條件句用過去完成時(shí)，選C。
點(diǎn)評(píng)：考查虛擬語(yǔ)氣的時(shí)候要注意和不同的時(shí)間相反的情況，主從句的時(shí)態(tài)是不一樣的。要注意記憶。
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