there are many people in the park .some are singing,are exercisingA others B the others 我问了俩老师,一个说选a,另一个说是b,我很纠结,在下很感激.麻烦说一下为什么

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• Several days ago,some students from the US visited our school.When we talked ,I discovered__1__differences in school life between the US and China .For example,each class__2__fifty minutes in the US.It is little longer than __3__in China.We usually have forty-five minutes in each class __4__difference is that they have less break time between classes.__5__,although most schools in both countries finish their __6__ classes at 12o'clock,the studentsin t
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