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

问题描述:

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~~~~~~~~~~~~~~~~请问哪里看出来是将来时??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~~~~~~~~~~~~~~~~