He will come to understand your efforts sooner or later. It’s just a of time.A. criterionB

问题补充：

He will come to understand your efforts sooner or later. It’s just a of time.

A. criterion

B. patent

C. variety

D. matter

答案：

A. criterion

B. patent

C. variety

D. matter

解析：考查名词：A.criterion标准B. patent专利C. variety各种各样D. matter事情，问题。句意：迟早他会理解你的努力的，这只是时间问题。选D。