Question

【题目】In the past decade the number of the workers in the factory(下降) by 15%.

Answer 1

【答案】has decreased
【解析】句意：在过去的十年间这家工厂的工人人数下降了15%。 decrease是指在此之前的十年间的持续状态，用现在完成时态，故填has decreased 。