必须警告吸烟者，医生已得出结论，吸烟会增加患肺癌的可性。（） A: Smokersmustwarnofthatdoctorshavegotaconclusionthatsmokingincreasesthefeasibilityoflungcancer. B: Doctorsmustwarnagainstthesmokerstheyhavecometoaconclusionsmokingincreasesthepossibilityoflungcancer. C: Smokersmustbewarnedthatdoctorshavereachedtheconclusionthatsmokingincreasesthepossibilityoflungcancer. D: Doctorshavewarnedsmokersthattheyhavedrawntheconclusionthatsmokingincreasesthefeasibilityoflungcancer.