He was unable to make such progress, ___
题型:选择题
问题:
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