--I wish I had succeeded in competitions. -- Yeah, I know. But ______ hard
A. did you work
B. do you work
C. had you worked
D. have you worked
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牛带绦虫
A. 成虫
B. 幼虫
C. 两者均可
D. 两者均不可
--How about some coffee -- It's very kind of you.
A. That's all right
B. It tastes nice and sweet
C. Just a little, please
D. I enjoyed it very much
下列选项中，有关( )问题的决策不属于非程序化决策。
A. 日常生产技术管理
B. 企业组织结构调整
C. 新产品开发
D. 企业合并或分立
Mrs, Weston went to see her doctor ______.
A. as soon as she realized that something was wrong
B. only after her husband advised her to
C. a long time after the trouble began
D. when John asked what was wrong with her
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