The policeman declared that the blow on the victim’s head______from behind.

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问题 The policeman declared that the blow on the victim’s head______from behind.

选项 A、should have been made
B、must have been made
C、would have been made
D、ought to have been made

答案B

解析 情态动词。对过去发生事情的肯定推测,用must+have done,选B。
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