We regret to inform you that the materials you ordered are out of.A. workB. reachC. stockD

问题补充：

We regret to inform you that the materials you ordered are out of.

A. work

B. reach

C. stock

D. practice

答案：

A. work

B. reach

(答案→)C. stock

D. practice

解析：stock out of stock“缺货” out of work“失业”；out of reach“够不到”；out of practice“荒疏，久不练习”。