He waited until it was dark nobody could see him clearly.A. so thatB. in order toC. altho

问题补充：

He waited until it was dark nobody could see him clearly.

A. so that

B. in order to

C. although

D. However

答案：

(答案→)A. so that

B. in order to

C. although

D. However

解析：目的状语从句要用in order that或so that引导。