手信号在向列车显示通过信号时，在确认列车（）后收回。
A、头部越过显示人
B、司机鸣笛回示
C、启动
D、车长显示发车信号
参考答案：A
病人但坐不得卧，卧则气逆者，属（）。
A.体弱气虚
B.气血俱虚
C.咳喘肺胀
D.肝阳化风
E.夺气脱血
He did not regret saying what he did but felt that he _____ it differently. [ ]
A. could express
B. would express
C. could have expressed
D. must have expressed
