only ___according to the directions can the medicine be quiret effective.a taking b taken c being taken d having been taken

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only___accordingtothedirectionscanthemedicinebequireteffective.atakingbtakencbeingtakendhavingbeenta

only ___according to the directions can the medicine be quiret effective.a taking b taken c being taken d having been taken
only ___according to the directions can the medicine be quiret effective.
a taking b taken c being taken d having been taken

only ___according to the directions can the medicine be quiret effective.a taking b taken c being taken d having been taken
b taken----------服用

C