— Did you find the missing couple in the mountain yesterday?

— No, but we ____ to get in touch with them ever since. [ ]

A. have tried

B. have been trying

C. had tried

D. had been trying

雇主责任保险合同的受益者是（）。

A.私营企业主

B.企业法人代表

C.该合同的被保险人

D.与雇主有雇佣关系的雇员