<p>I wonder who cleaned the house yesterday. It （）have been John because he and I were out of town all day.</p>

I wonder who cleaned the house yesterday. It （）have been John because he and I were out of town all day.

I wonder who cleaned the house yesterday. It （）have been John because he and I were out of town all day.

mustn’t

needn’t

couldn't

won’t

正确答案C

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