An ambulance was pulling over. Somebody would be hurt or sick somewhere nearby.

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问题 An ambulance was pulling over. Somebody would be hurt or sick somewhere nearby.

选项 A、must be
B、should have been
C、should be
D、must have been

答案D

解析 本题考查情态动词的用法。根据句意,这里表示肯定的猜测,因此要用must,且要用完成时表示过去(因为was pulling over发生在“生病”或“受伤”之后),即must have been,故D正确。
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