ABD显然不对.如果要用there be 句型此句应为In One of the rooms there are three doors.或There are three doors in oneof the rooms.
而此句跟条件句完全搭不上边,所以不选if.
主语为单数,所以选E
ABD显然不对.如果要用there be 句型此句应为In One of the rooms there are three doors.或There are three doors in oneof the rooms.
而此句跟条件句完全搭不上边,所以不选if.
主语为单数,所以选E