Question

As he was about to go out to search for Mary, she happened ____. A．to coming in B．to come .

As he was about to go out to search for Mary, she happened ____. A．to coming in B．to come in C．came in D．to have come in

Answer 1

B
考查happen用法。Happen发生，碰巧；happen
to
do
sth碰巧做某事；句意：当他正要出去找Mary的时候，她碰巧进来了。D项表示已经完成的事情，不符合句意。故B正确。