Such crimes may be so complex that months or years go by before anyone ______ them.

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问题 Such crimes may be so complex that months or years go by before anyone ______ them.

选项 A、discovered
B、will discover
C、would have discovered
D、discovers

答案D

解析时态题。在时间和条件状语从句中，可用一般现在时表示将来。故D正确。

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专业英语四级

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