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?
人气：450 ℃ 时间：2020-06-05 00:46:18
解答
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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