提问者：xiaozeng

正文

1.I have learned English for three years. It is three years( )I( )to learn English. 2.My sister has been ill for two weeks.She's afraid that shc won't catch up with her classmates. My sister is afraid that she will__________ ___________her classmates as she has been ill for two weeks. 3.The Browns went back to London by plane last week. -

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