Look, a police car is coming. There ______(前面肯定是出交通事故了).must be some traffic acc

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问题 Look, a police car is coming. There ______(前面肯定是出交通事故了).

选项

答案 must be some traffic accident ahead

解析 ①考查情态动词用法。must表示很有把握的推测，意为“一定，肯定”，对现在和将来的情况作推测时，后接动词原形。②There提示用there be句型，表示“某处有某物”。

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