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

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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