冻结、止付、质押交易需（）授权。
A、3级以上
B、3级以上（含3级）
C、4级以上
D、4级以上（含4级）
参考答案：B
— Is Tom still smoking?
— No. By next Saturday he ＿＿ for a whole month without smoking a single cigarette.
A．will go
B．will have gone
C．will have been
D．has been going
