Question

If I ______ about this computer program, a hage amount of time and energy would have been saved...

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

Answer 1

C

试题分析：考查虚拟语气：句意：如果我知道这电脑程序，大量的时间和精力就会被节省下来，从句意和主句的would have done可知是和过去相反的虚拟语气，if条件句用过去完成时，选C。 点评：考查虚拟语气的时候要注意和不同的时间相反的情况，主从句的时态是不一样的。要注意记忆。