that you didn’t care about this matter at all, I should not have wasted my time explaining it to you.
A．Should I realizeB．Had I realized
C．If I realized D．Did I realized
B
考查條件中與過去事實相反的虛擬語氣。其結(jié)構(gòu)為if +主語+had done，主語+would /could/should/might + have done,省略if要倒裝，had提前。故選B。
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