Nobody can achieve anything of real significance he works very hard.A. ifB. unlessC. mean

问题补充：

Nobody can achieve anything of real significance he works very hard.

A. if

B. unless

C. meanwhile

D. as

答案：

A. if

(答案→)B. unless

C. meanwhile

D. as

解析：考查连词辨析。Unless除非，如果…不…;结合句意可知B正确。句意：如果不努力工作，没有人能实现真正重要的事情。