问题标题:
.IfonlyI________howtooperateanelectroniccomputerasyoudo.A.hadknownB.wouldknowC.shouldknowD.knew
问题描述:

.IfonlyI________howtooperateanelectroniccomputerasyoudo.

A.hadknownB.wouldknow
C.shouldknowD.knew

黄珂萍回答:
  D   因为ifonly(要是…就要了)其后的句子要用过去式表示虚拟语气,由asyoudo可知,是与现在事实相反,所以选knew。
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