噎膈的基本病机在于
A．胃失和降B．食管狭窄C．肝郁气滞D．脾失健运E．肝胃不和
参考答案：B
It was some time _____ I realised the fact that life had become difficult for many villages in western Europe.
A．until
B．before
C．unless
D．since
含混
