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backdate的一般过去时为：backdated...
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backdate的现在进行时为：backdating...
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backdate的第三人称单数（三单）为：backdates...
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backdate的音标：backdate的英式发音音标为：[ˌbæk'deɪt]backdate的美式发音音标为：['bækˌdet]...
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Anyone who has overpaid tax will be able to backdate their claim to last April.超额纳税者申领退款可以从去年4月算起。Backdate your invoice to April 1 st.你的发票日期应填到4月1日算起....
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backdate的现在完成时为：backdated...