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一个英语问题求教!Itwasseveralmonths()Ifinallyrealized()Davidhadliedtome.AwhenthatBsincewhenCbeforethatDuntilwhy为什么选C?A错在哪?(这类题一直不会,请问这属于哪一类语法点)

题目详情
一个英语问题求教!
It was several months () I finally realized () David had lied to me.
A when that
B since when
C before that
D until why
为什么选C?A错在哪?(这类题一直不会,请问这属于哪一类语法点)
▼优质解答
答案和解析
it is /was .before that .(强调句)
It was several months before I finally realized 考的是before 的用法 .之后 才.