汽车在三档运行中收油掉档，并且经常发生此故障，有可能是（）。
A.齿轮传动机构失效
B.自锁装置失效
C.互锁装置失效
D.变速装置失效
参考答案：B
心悸失眠，自汗出，当选用（）
A.柏子仁
B.朱砂
C.磁石
D.酸枣仁
E.龙骨
— I'll tell Mary about her new job tomorrow.
— You ______ her last week. [ ]
A. ought to tell
B. would have told
C. must tell
D. should have told
