摘要:(典型例题I failed in the final examination last term and only then the importance of studies. A. I realized B. I had realized C. had I realized D. did I realize 答案:D 指导:当only修饰状语置于句首时.句子要用倒装.且该句的谓语是过去某时的动作.需用一般过去时.故正确答案为D.

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