The police knew nothing about the case______your father phone them.

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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 not…until…意为“直到…才…”，故选D。如果选B，主句则要用完成时态。

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大学英语三级A级

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