2. 外语
  3. The police ______ the evidence last time, but they did not.

The police ______ the evidence last time, but they did not.

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问题 The police ______ the evidence last time, but they did not.
选项 A、must have found out
B、should have found out
C、must find out
D、could find out
答案B
解析 “should+不定式完成体”可以表示发生在过去的、应该做到的事情。“must+不定式完成体”则常常用于表示对过去可能发生的事件的推测，假如用在本题中，这种推测太肯定，跟下文的意义发生矛盾。
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