they have PE classes twice_____ three times a week but we exercise only on weekends.A andB or

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they have PE classes twice_____ three times a week but we exercise only on weekends.A    andB    or

they have PE classes twice_____ three times a week but we exercise only on weekends.A andB or
they have PE classes twice_____ three times a week but we exercise only on weekends.
A and
B or

they have PE classes twice_____ three times a week but we exercise only on weekends.A andB or
they have PE classes twice_____ three times a week but we exercise only on weekends.
选B
翻译
他们一周有两节或三节体育课,我们却只有在一周最后有一节
两个之间是选择关系,所以用or
两次是有固定说法twice的,三次及以上都是基数词+times表示次数

B