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19、         fresh air，people may start to feel sick．So make sure you open the windows while working．

A．For the absence of                                          B．In the absence of

C．In the honor of                                                 D．In the short of

19、B

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         fresh air，people may start to feel sick．So make sure you open the windows while working．

A．For the absence of                                          B．In the absence of

C．In the honor of                                                 D．In the short of

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