I am not surprised that the Murphys are not here now. They______been delayed at home because the streets are so crowded today.

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问题 I am not surprised that the Murphys are not here now. They______been delayed at home because the streets are so crowded today.

选项 A、should have
B、can have
C、must have
D、will have

答案C

解析句意：莫斐一家现在不在，我并不感到奇怪。他们一定是被耽搁在家里了，因为今天街上太拥挤了。must have done是对过去发生的动作最有把握的猜测，意思是“一定”，符合句子逻辑。故正确答案为C。

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