单项选择题
Once he starts a job, he won't stop（）it is finished.
A.till B.after C.before D.until
单项选择题 （）you told me, I had heard nothing of what happened.
单项选择题 The president claimed the terrorists should be held responsible（）the explosions that happened last month in London.
单项选择题 His parents will be（）him if he fails the examination.
