The new device for aiding memory works like a common pacemaker,sends electrical pulses to aid the brain when it is struggling to store new information, but remains quiet when it senses that the brain is functioning well.
A. sends electrical pulses to aid the brain when it is struggling to store new information, but remains
B. sending electrical pulses to aid the brain when it is struggling to store new information, remains
C. sending electrical pulses to aid the brain when it is struggling
...
A. sends electrical pulses to aid the brain when it is struggling to store new information, but remains
B. sending electrical pulses to aid the brain when it is struggling to store new information, remains
C. sending electrical pulses to aid the brain when it is struggling
...





