Staying in a hotel costs ________ renting a room in a dormitory

Staying in a hotel costs ________ renting a room in a dormitory for a week.
A、twice more than
B、twice as much as
C、twice as many as
D、as much as twice
【正确答案】：B
【题目解析】：twice as much as ....是....的两倍
句意：住旅馆的费用是租宿舍房间一周的费用的两倍。