. If only I ________ how to operate an electronic computer as you do. A．had known B．would .
.IfonlyI________howtooperateanelectroniccomputerasyoudo.A．hadknownB．wouldknowC．should...
. If only I ________ how to operate an electronic computer as you do. A．had known B．would know C．should know D．knew
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| D |
| 因为if only (要是…就要了) 其后的句子要用过去式表示虚拟语气，由as you do可知，是与现在事实相反，所以选knew。 |
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