作业帮Yesterday when he came to see me ,I ______(happen) to be out.
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Yesterday when he came to see me ,I ______(happen) to be out.
Yesterday when he came to see me ,I ______(happen) to be out.
Yesterday when he came to see me ,I ______(happen) to be out.
happened
happen to do 正巧去做某事
没有be happened to do,happen是不及物的