19、—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
19、D
科目：高中英語(yǔ) 來(lái)源： 題型：單選題
科目：高中英語(yǔ) 來(lái)源： 題型：
—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
科目：高中英語(yǔ) 來(lái)源： 題型：
—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
科目：高中英語(yǔ) 來(lái)源：福建省廈門市2010屆高三上學(xué)期期末考試 題型：單選題
—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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