—The one on the right.

A. WhichB. WhatC. WhoseD. How many

【答案】A

【解析】

句意：——你要乘坐哪个电梯？——右边这个。

考查特殊疑问句。Which哪一个；What什么；Whose谁的；How many多少。根据答语The one on the right.可推断问句是指哪一个。故选A。