Our class teacher turned away ____ I could give my reason for not having finished my work.A.before B.as C.when D.after为什么选A?

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Our class teacher turned away ____ I could give my reason for not having finished my work.
A.before B.as C.when D.after
为什么选A?

句子想表达的意思就是:在我想说明理由为什么没有完成作业之前,老师就扭头走了 (before 在...之前)
after 肯定不对了 翻译不通