—Those scientists invented a robot to care for kids! —It’s not surprising.They ____ wonders all the

题目简介

—Those scientists invented a robot to care for kids! —It’s not surprising.They ____ wonders all the

题目详情


—Those scientists invented a robot to care for kids!
—It’s not surprising.They ____ wonders all the time.
A.workedB.were workingC.workD.have been working
题型:单选题难度:偏易来源:不详

答案

D
考查时态。句意:这些科学家发明了一个机器人来照顾孩子。——不奇怪。他们一直在创造奇迹。可知下文描述的是现在已经完成的过去一直在进行的动作,故用过去进行时态。选D。

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