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

解析試題分析：考查虛擬語氣：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，從句意和主句的would have done可知是和過去相反的虛擬語氣，if條件句用過去完成時(shí)，選C。
考點(diǎn)：考查虛擬語氣
點(diǎn)評(píng)：考查虛擬語氣的時(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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