______ what you intended, I should not have wasted my time trying to explain matters to you.

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问题 ______ what you intended, I should not have wasted my time trying to explain matters to you.

选项 A、If I realized
B、Did I realized
C、Were I realized
D、Had I realized

答案D

解析 对过去情况的虚拟,用过去完成时,if I had realized,此句又可省略if,并把had放于句首,构成选项D。
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