They usually ( ) ( have) on classes on weekends用适当形式填空

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They usually ( ) ( have) on classes on weekends用适当形式填空
They usually ( ) ( have) on classes on weekends
用适当形式填空

They usually ( ) ( have) on classes on weekends用适当形式填空
They usually have classes on weekends
一般现在时,珠玉是复数形式,所以使用have的动词原形.

填 have
usually说明是一般现在时

have on应该是 no吧