they _____exercise after class at schoolA some time ,B sometime,C sometimes理由充分

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they _____exercise after class at schoolA some time ,B sometime,C sometimes理由充分
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they _____exercise after class at schoolA some time ,B sometime,C sometimes理由充分
they _____exercise after class at school
A some time ,B sometime,C sometimes
理由充分

they _____exercise after class at schoolA some time ,B sometime,C sometimes理由充分
选C,注意区别:
some time:一段时间
sometime将来或过去的某个时间
sometimes 有时候