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

【答案】has decreased
【解析】句意:在過(guò)去的十年間這家工廠的工人人數(shù)下降了15%。 decrease是指在此之前的十年間的持續(xù)狀態(tài),用現(xiàn)在完成時(shí)態(tài),故填has decreased 。

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