The police knew nothing about the case ______ your father phone them.A、afterB、s

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问题 The police knew nothing about the case ______ your father phone them.

选项 A、after
B、since
C、as
D、until

答案 D

解析句意：在你爸爸打电话给警察前她们对这个案子一无所知。该句考查固定短语。not... until...意为“直到…才…”。根据句意应选D。如选B主句要用完成时态。

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