题目内容：

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

优质解答

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