21、It is three years _____ my brother joined the army and it will be ten days ____ he comes back to see my parents.

A. when; after     B. since; when      C. before; until       D. since; before

21、D

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科目：高中英語(yǔ) 來(lái)源： 題型：

It is three years _____ my brother joined the army and it will be ten days ____ he comes back to see my parents.

    A. when; after    B. since; when   C. before; until    D. since; before

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科目：高中英語(yǔ) 來(lái)源： 題型：

It is three years _____ my brother joined the army and it will be ten days ____ he comes back to see my parents.

A. when; after     B. since; when      C. before; until       D. since; before

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