Помогите решить тест1)When he ... The room he ... out that

Помогите решить тест
1)When he ... The room he ... out that somebody ... already ... there before.
A) entered, had found, would, be
B) would enter, would find, had, been
C) will enter, will find, has, been
D) enteres, will find, have, been
E) entered, found, had, been