题目内容
The book was written in 1946, the education system has witnessed great changes.?
A.when B.during which? C.since then D.since when
D
since when=since 1946,此处用since来连接两个句子,主句要用现在完成时态。
练习册系列答案
相关题目
题目内容
The book was written in 1946, the education system has witnessed great changes.?
A.when B.during which? C.since then D.since when
D
since when=since 1946,此处用since来连接两个句子,主句要用现在完成时态。