(2013·天津新华中学二次月考)________ several times,he still couldn't understand how to operate the machine.
#89556
A
Telling
B
Having told
C
To be told  
D
Having been told
推荐题目
We should prevent such a silly mistake _____ again.
#98848
A
occurring
B
to occur
C
to be occurred
D
from being occurred
_____ in 2011, the Beijing-Shanghai high-speed railway has benefited Qufu a lot.
#88693
A
To complete
B
Completing
C
Having completed
D
Completed