. If only I ________ how to operate an electronic computer as you do.
A．had knownB．would know
C．should knowD．knew
D
因?yàn)閕f only (要是…就要了) 其后的句子要用過(guò)去式表示虛擬語(yǔ)氣，由as you do可知，是與現(xiàn)在事實(shí)相反，所以選knew。
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