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：考查虛擬語氣：句意：如果我知道這電腦程序，大量的時間和精力就會被節(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，選C。
點評：考查虛擬語氣的時候要注意和不同的時間相反的情況，主從句的時態(tài)是不一樣的。要注意記憶。
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