The twin sister______(learn)Chinese since they came to China

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The twin sister______(learn)Chinese since they came to China.
I often mistake Lucy____Lily.A.as B.make C.with D.for
have been learning
不是要 have been +v过去分词怎么是learning 不是learned

mistake for 是固定搭配,“错把什么误认为什么”
since是完成式的标志,因为动作是从过去一直持续到现在,一直在进行的,要用现在完成进行时

The twin sister______(learn)Chinese since they came to China Since I came to China,I__________ (learn)a lot about Chinese The americans go to China to learn Chinese the twin sisters have learned a lot ____they came to China A They've made friends since they came to China这句话哪里错了? The Blacks___many places of interest since they came to chin How long__tom__ (learn)chinese befor he came to china?完形填空.最 How long__tom__ (learn)chinese befor he came to china?完形填空, How long have___lived here?Since they came to China three ye Go to China to learn Chinese To learn Chinese,go to China mary___some chinese before she came to china