every sunday we have fun_____to sing english songs a;learn b;learning c;to learn d;learns

问题描述:

every sunday we have fun_____to sing english songs a;learn b;learning c;to learn d;learns

learning。have fun doing做。。很开心

b
have fun doing sth作...很开心

B
have fun = have a good time = have a great time = enjoy oneself 后面加 in doing sth.,(in可省略),表示:做什么事很开心、很有趣
这里没有in learning,选省略in的learning,即B