英语：my parents have promised to come to see me before i（）for

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英语：my parents have promised to come to see me before i（）for Africa
A have left B leave C left D wll leave
选哪个为什么

B
主从都是将来时,那么从句改为一般现在时,
~~~~~~~~~~～～~~~~祝你进步,如对你有帮助,请及时采纳~~~~~~~~~~~~~~~~
再问：请问哪里看出来是将来时？？
再答：主语是promise to come 许诺去，也就是还没去，要去，所以是将来时 ~~~~~~~~~~～～~~~~祝你进步，如对你有帮助，请及时采纳~~~~~~~~~~~~~~~~

英语：my parents have promised to come to see me before i（）for My parents have promised to come to see me before I -----for My parents have promised to come to see me before I ________ )My parents have promised to come to see me before I _____fo 选择：My parents have promised to come to see me before I——(lea my parents are promised to come to see me before i __ （填空）l my parents are promised to come to see me before i __（填空）{le my parents have promised to come to see me before I_____(lea my parents are promised to come to see me before i __{leave} 时态填空；i hope my parents -------(come) to see me next year. -My friend ,Tom ,promised to come to see you.-But he( ) .I h you see,my mum promised to buy me ___ MP4 for my birthday.