I"m writing on _______of my mother,to express her thanks for your gift.??

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    题型：单项选择题难度：简单
    I"m writing on _______of my mother,to express her thanks for your gift.??
    [???? ] A. behaviour????????????????????
    B. behalf??
    C. belief??????????????????????????
    D. basis
    答案
    B

高考

I"m writing on _______of my mother,to express her thanks for your gift.??