求大师详解：only when he had handed in his exam paper,__ he had made se_英语解答

求大师详解：only when he had handed in his exam paper,__ he had made several grammatical mistakes.
A.would he realize
B.he realized
C.has he realized
D.did he realize

人气：262 ℃　时间：2020-06-06 13:16:16

解答

D.only放在句首,句子要半倒装,从时态来讲,要用过去时.
不明白的再问哟,请及时采纳,多谢!