_____ for your brother, I would not have gone to see Mr. Wang.

A．If it is not

B．Were it not

C．Had it not been

D．If they were not

中南半岛的地形特征是[ ]

A、多盆地地形

B、海拔较高，以高原为主

C、地势平坦，起伏不大

D、山河相间，纵列分布