在过去几十年里，政府采取了各种措施防止灾害发生。 A: Inthepastfewdecades,thegovernmenthastakenvariousmeasurestopreventdisastersfromhappening. B: Inthepastfewdecades,thegovernmenthastakenvariousmeasurestopreventdisasters. C: / D: /