问题描述：
29.Before the medicine, ought to study the instructions or follow the doctor's .
29.Before _______ the medicine,_________ought to study the instructions or follow the doctor's________.
A.you take;you;advise B.you take;one;advice
C.taking;one;advice D.taking;you;advise
29.Before _______ the medicine,_________ought to study the instructions or follow the doctor's________.
A.you take;you;advise B.you take;one;advice
C.taking;one;advice D.taking;you;advise
问题解答：
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