they went to the cinema once a week

为什么要有定冠词THE？去电影院不是go to cinema 么？这个句子怎么翻译呢？
那为什么就不可以他们每隔一周去看一次电影呢？
因为这个是个选择题
a the b / c a d an
我觉得选择b貌似也翻译的通顺啊

They went to Blue Water Aquarium for the day。 _____ their homework, they went to the playground to play football In the moning of friday,they went out to have a walk.改错 修改病句: They went to bed until their mother came home. 选择英语:After parking the car they went to [ ] the evening. they went to the park ______ tom because he was too busy. 是WITHOUT 还是EXCEPT?为什么? They went to school for nine years, ＿＿＿＿(begin)at the age of seven. they went to beijing three days ago.和the have been in Beijing for three days .句意有区别吗？ It was a girl who was a comic fan like herself and they went to a comic show together. went to his studys