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 本题考查时态。根据题意，动作发生在将来，而不是在过去，故排除A ，也不是表达一种与过去相反的事实，故排除C 。题干中包含一个时间状语从句。在时间状语从句中，从句可用一般现在时表示将来发生的事情，故答案为D 。
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