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The book was written in 2001,___the education system has witnessed great changes.A.in which B.since when 为什么不选A?
题目详情
The book was written in 2001,___the education system has witnessed great changes.
A.in which B.since when 为什么不选A?
A.in which B.since when 为什么不选A?
▼优质解答
答案和解析
根据后面的HAS WITNESSED （现在完成时）可知 是用SINCCE WHEN,如果用A是一般过去时.
加油!不明白再问!
加油!不明白再问!
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