As he was about to go out to search for Mary, she happened ____.
A．to coming inB．to come inC．came inD．to have come in
B
考查happen用法。Happen發(fā)生，碰巧；happen to do sth碰巧做某事；句意：當(dāng)他正要出去找Mary的時候，她碰巧進(jìn)來了。D項表示已經(jīng)完成的事情，不符合句意。故Ｂ正確。
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