2. 专升本
  3. An ambulance was waiting in the street. Somebody______hurt or killed.

An ambulance was waiting in the street. Somebody______hurt or killed.

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问题 An ambulance was waiting in the street. Somebody______hurt or killed.
选项 A、must be
B、may be
C、must have been
D、can have been
答案C
解析 情态动词表推测。对过去事情100％肯定的推测用must have done．
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