代时
参考答案：细菌分裂倍增的必须时间。
We are invited to a party ____ in our club next Friday. [ ]
A. to be held
B. held
C. being held
D. holding
白喉的病原体是
A．白喉棒状杆菌B．假白喉棒状杆菌C．溃疡棒状杆菌D．干燥棒状杆菌E．其他假白喉棒状杆菌
