Although some doctors believe that the drug can have positive effects when taken sporadically, most agree that the medicine is effective only if it is administered in a single, concentrated dose.

(A) only if it is administered in a single, concentrated dose

(B) if it was administered only in a single and concentrated dose

(C) if it would only be administered in a concentrated dose, singly

(D) only if it would only be administered in a singly concentrated dose

(E) if it is administered only in a dose concentrated singly


OA A

Source: Princeton Review