I was doing my homework when she came------(to,in)my house要选

come to
v.想起；共计,达到
come in
进来；到达；流行起来
根据意思 应该是to达到这个意思
I was doing my homework when she came （to) my house
当她来到我屋子时,我在做作业
因为come in vi 不及物动词后不能直接跟有动作的对象（即宾语）.
例句：Please come to my office now.
现在请到我的办公室来.