Since I came to China,I__________ (learn)a lot about Chinese

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Since I came to China,I__________ (learn)a lot about Chinese history
Since I came to China,I’ve been learning a lot about my family history.这句是成立的！

since后常跟过去式,主句用现在完成时.故：
Since I came to China,I have learned (learn)a lot about Chinese history
自从我来到中国以后,我已经了解了很多的中国历史.
since后常跟过去式,主句用现在完成进行时也行,不过多用现在完成时.

Since I came to China,I__________ (learn)a lot about Chinese The twin sister______(learn)Chinese since they came to China I want to learn a lot about China because I love China.(对bec I want to learn a lot about China because I love China 对 bec I can learn a lot about Chinese history.翻译 learn I history can about Chinese a lot . I can learn about Chinese history a lot. I can learn a lot about Chinese history.改错题 I can learn a lot about history. I can learn about Chinese h I can learn a lot about history.I can learn about Chinese hi He ____ a lot of friends since he came to China.A.has made B i learn a lot about chinese history中a lot等于much和many things