7、Don’t forget __________when you finish __________ your computer．

A．turning off；to use                                     B．to turn it off；using

C．to turn off it；to use                                          D．to turn it off；to use

7、B

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Don’t forget __________when you finish __________ your computer．

A．turning off；to use                                     B．to turn it off；using

C．to turn off it；to use                                          D．to turn it off；to use

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