Question

Our special thanks to go thousands of volunteers, without ____tireless work, none of this would be possible.

A．which

B．whom

C．whose

D．that

Answer 1

C

解析试题分析：句意：我们特别感谢成千上万的志愿者，没有他们不辞辛苦的工作，这一切都不会成为可能。without ____tireless work是非限制性定语从句，修饰volunteers，所填词要做定语，用whose 。所以选C。
考点：考查定语从句中的关系代词。