快速压力蒸汽灭菌方法可不包括干燥程序,运输时避免污染,2小时内使用,不能储存。
参考答案:错
— Is Bob still performing?
— I'm afraid not. He is said _____ the stage already as he has become an official.
[ ]
A. to have left
B. to leave
C. to have been left
D. to be left