一到英语的选择题you must finish doing your homework before I____back

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一到英语的选择题
you must finish doing your homework before I____back.
A.will come B.come C.came
这道题目我是这样分析的“你必须完成你的作业在我回来前,”既然你还没有回来,所以我选择了将来时A..但是好像不对..请问是为什么呀?

选B.句意是:在我回来之前你必须完成作业.
come 这个动词是指将来,可是在before 和after之后不能用将来时,动词的现在时即表示将来动作.
比如说,I will go home before it rains.(我会在下雨之前回家) All his money will be given to his son after he dies.(他死后所有的钱都会给他儿子)

you must finish doing your homework first的句子结构 you must finish your homework before you go to bed When you finish doing your homework ,you must c_____ it. 请问!You must finish your homework before watchingTVshismjuxin 为什么是you must finish doing your homework,而不是you must finish y You must finish your homework before you go to bed同义句 you must finish your homework before you go to bed.（同义句） _ _ You must finish your homework （one） you must finish your homework before____to bed 1、Yon must finish your homework before you go to bed.(同义句）英语填空一、根据首字母填空1、F___ of all,you must finish your homework.2、F You shouldn't play football before you finish your homework(