Follow your doctor's advice,________ your cough will get worse．

Follow your doctor's advice,________ your cough will get worse．

A.or

B.and

C.then

D.so

答案及解析： A

解析：

考查固定句式。祈使句+and/or/then you'll…．根据句意选A．听从医生的建议，否则你的咳嗽会更严重。