—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

获得性血小板功能异常症，下列哪项检查结果是错误的（）。

A.出血时间延长和血小板计数减低

B.血小板黏附和聚集功能减退

C.血小板第3因子有效性减低

D.血块收缩正常

E.β-TG和TXA₂增高