My uncle and aunt live in Washington.They come to see us _____ a year.填空.选择：A.two B.second C.twice D.two times

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My uncle and aunt live in Washington.They come to see us _____ a year.填空.选择：A.two B.second C.twice D.two times

My uncle and aunt live in Washington.They come to see us _____ a year.填空.选择：A.two B.second C.twice D.two times
My uncle and aunt live in Washington.They come to see us _____ a year.
填空.
选择：
A.two B.second C.twice D.two times

My uncle and aunt live in Washington.They come to see us _____ a year.填空.选择：A.two B.second C.twice D.two times
C.twice