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

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

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

b
have fun doing sth作...很开心

learning。have fun doing做。。很开心