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He was unable to make such progress, ____.

A. hard as he tried                         B. as hard he tried        

C. hard he has tried                        D. tried hard as he

He was unable to make such progress, __________________.

A．as he tried hard     B．as hard he tried     C．so hard did he try   D．hard as he tried

He was unable to make such progress, _______.

A. as he tried hard?

B. as hard he tried?

C. so hard did he try?

D. hard as he tried?

He was unable to make such progress, _______.

A. as he tried hard  B. as hard he tried  C. so hard did he try D. hard as he tried