BythetimeDickgottoclass,hismathteacherhadalreadystartedteaching.A.Befo

发布时间：2020-08-06 19:31:26

By the time Dick got to class, his math teacher had already started teaching.A.BeforeB.As soon asC.WhileD.When

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D解析点拨：此句的主句为过去完成时，by the time意为“当……的时候”，可用when替代。
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