购买的商品房在产权登记时，必须按( )的方式进行登记。
A．建筑面积计算
B．使用面积计算
C．套内建筑面积计算
D．以套为单位
参考答案：A
—Lucy has gone to China for her holiday.
—Really?When________back?[ ]
A. is she coming
B. did she come
C. had she come
D. has she come
Here is the . Let’s take the bus to the library.
A．club B．stop C．bridge
