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单句改错1 Please tell me the reason which you refused to help hi

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单句改错
1 Please tell me the reason which you refused to help him with his homework.
2 The road is being repaired,so we had to take another one.
3 When the Nazis had gone,people of ST Petersburg began rebuilding the city.
4 In China students learn English at school as a foreign language,except for those in HongKong,which many people speak English as a first or a second language.
单句改错1 Please tell me the reason which you refused to help hi
which 改成 why ,因为从句是解释前面的原因而并非对前面的选择
had 改成have 看得出来 这是一般过去式语句自然不能用过去时
原句改成When the Nazis went ,people of ST Petersburg had begun rebuilding the city 这是一个过去完成时的句子,根据过去完成时结构可以看出此句结构出错
which改成 where 从句后省略的宾语为地点 因此先行词用where引导
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