If only I ( had learned ) how to operate a computer.
句子的意思是“要是学会了如何操作电脑就好了”
这个句子明显是 对过去的虚拟,表示“要是过去已经会.” 所以用完成时态.
learned 只能是对现在的虚拟
为什么要填had learndIf only I ( ) how to operate a computer.learn
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