happen to do sth

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happen to do sth
I happened _______ when Linda called me yesterday.
A.to out B.to be out C.be out D.am out
请问为什么

happen to do sth 是碰巧做某事的意思
上面的意思是,昨天linda叫我的时候我刚好要出门.
首先排除 CD,没有happen do的句型
再来看B,to be out 的意思是不定式的被动语态,这样翻译就是碰巧被出门.
逻辑不符合.
所以我们选A

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