钡餐检查，病理性胃形态为（）
A.牛角型
B.瀑布胃
C.葫芦型
D.鱼钩型
E.无力型
参考答案：C
_________ many times, he finally understood it.
A．Told
B．Telling
C．Having told
D．Having been told
You ______ last week if you were really serious about your work.
a. ought to come b. ought to be coming c. ought have come d. ought to have come
