Exposure to asbestos fibres is harmful to people' s health ______.A) so the use of asbestos is limitedB)but asbestos will continue to be used for a long time to comeC) so other new kinds of materials are under developmentD) but they will not be so when ventilation devices are used

Exposure to asbestos fibres is harmful to people' s health ______.

A) so the use of asbestos is limited

B)but asbestos will continue to be used for a long time to come

C) so other new kinds of materials are under development

D) but they will not be so when ventilation devices are used

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