—Those scientists invented a robot to care for kids! —It’s not surprising．They _
题型：不详难度：来源：
—Those scientists invented a robot to care for kids!
—It’s not surprising．They ____ wonders all the time．| A．worked | B．were working | C．work | D．have been working |
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答案
| D |
解析
| 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。 |
举一反三
Either the ways or the time ____ yet, but you may ask the headmaster for some information．| A．isn’t decided | B．hasn’t decided | C．aren’t decided | D．haven’t decided |
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_______ , the girl worked in a hurry.| A．Having swept the room | B．Another room swept | | C．Having another room to sweep | D．Having another room to be swept |
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______ the plan means we must start from the very beginning. | A．Abandoned | B．Abandoning | C．Being abandoned | D．Having abandoned |
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．—Remember the first time we met?
—Sure．You ____in the supermarket．| A．shopped | B．have shopped | C．had shopped | D．were shopping |
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The rest of the apple _________.| A．were throwing away | B．was throwing away | | C．were thrown away | D．was thrown away |
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