单项选择题

______many times, he still doesn't know how to use the computer.

A．He has been told
B．We have told him
C．Having been told
D．Having told him
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单项选择题
A．had takenB．had sentC．had drivenD．had forced
A．had taken
B．had sent
C．had driven
D．had forced
单项选择题
A．eveningB．nightC．timeD．o'clock
A．evening
B．night
C．time
D．o'clock
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