Everyone in my class _________(be)running in playground.为什么是is而不是are呢?

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Everyoneinmyclass_________(be)runninginplayground.为什么是is而不是are呢?Everyoneinmyclass_________(be)runnin

Everyone in my class _________(be)running in playground.为什么是is而不是are呢?
Everyone in my class _________(be)running in playground.
为什么是is而不是are呢?

Everyone in my class _________(be)running in playground.为什么是is而不是are呢?
Is