26.IfI ______________the challenges at that time, I might not have started my own business.
A)would know
B) have known
C)had known
D) will know
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27. It was not until last July___________we started to distribute e-readers and launched ane-book store.
A)that
B)who
C)which
D)whom
28.__________the library for hours without finding anything useful, I turned to my professor for help.
A)To search
B)Having searched
C)Have searched
D)Searching
29.___________some degree,all managers who supervise peoplc are involved in HR activities.
A)On
B)To
C)For
D)With
30. Our online computer repair and tech support is a convenient way to have your computer___________withouthaving to leave your home.
A)to fix
B)fixing
C)fix
D)fixed