高手帮忙：That was written in 1946, since______the education system has undergone great changes.
A then B when C there D which 选B.可我不明白为什么不选A呢,
since then 不是加现在完成时吗? 比如 I visited China in 1900. since then, china has undergone great changes. 不是很正常吗?给我详细说说吧,我都失望了,那么多人都觉得不屑的问题我咋就不懂呢.
人气：383 ℃ 时间：2020-05-05 16:28:10
解答
since在这里是自从的意思 后跟的句子缺时间状语 所以用whenThat was written in 1946, since______the education system has undergone great changes.考的是定语从句I visited China in 1900. since then, china ha...
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