We played happily in the school yard________we got back to our classroom.A,after B.before C.while D.when

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We played happily in the school yard________we got back to our classroom.
A,after B.before C.while D.when

选B.before
根据句子意思 在重回教室之前,我们在操场玩得很开心.

before
在我们返回教室之前,我们在校园玩得很开心

BESIDES