“How did it ________ that the new machine was out of order？” asked the manager.  [ ]

A．come across  

B．come about

C．come out  

D．come round

糖尿病患者，血糖低于多少且无酸中毒症状可考虑拔牙

A．7.88mmol/L
B．8.88mmol/L
C．9.88mmol/L
D．10.88mmol/L
E．11.88mmol/L