They have a new house_____four rooms.

问题描述:

They have a new house_____four rooms.

若填一个词,则是“with”,with表伴随,即“一个有四个房间的新房子”;
也可以填"which has“,将其变为一个以house为先行词的定语从句,由于house是物,又在后句中作主语,所以用which.

with带有 他们的新房子有四个房间

with
带有