办理强制性产品认证申请时，应向所在地检验检疫机构提出申请。 ( )
参考答案：错
— Where is Bob? I cannot find him anywhere.
— He _____ have been off long. I heard him make a call just now.[ ]
A. shouldn't
B. can't
C. mustn't
D. needn't
售票时输入票种票额的快捷键是（）。
A.F2
B.F5
C.F6
D.F7
