—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
D
考查時(shí)態(tài)。句意：這些科學(xué)家發(fā)明了一個(gè)機(jī)器人來(lái)照顧孩子�！黄婀帧Ｋ麄円恢痹趧�(chuàng)造奇跡。可知下文描述的是現(xiàn)在已經(jīng)完成的過(guò)去一直在進(jìn)行的動(dòng)作，故用過(guò)去進(jìn)行時(shí)態(tài)。選D。
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