求大师详解:only when he had handed in his exam paper, __ he had made several grammatical mistakes. 用这个ha

求大师详解:only when he had handed in his exam paper, __ he had made several grammatical mistakes. 用这个ha

题目
求大师详解:only when he had handed in his exam paper, __ he had made several grammatical mistakes. 用这个had he relized 行吗?
答案
did he realize
only在从句句首,主句用倒装 结构
而前面俩个动作hand in和make mistakes都是发生在realize之前,所以用过去的过去,而realize只要用一般过去就好
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