• 2022-06-06
    The professor told him not to talk in class. He ________________ by the professor not to talk in class.
  • was told

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      Professor Smith will not be able to attend the meeting this afternoon because he __________ (teach) a class.

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      It's time for class. Boys and girls, stop __________. A: talk B: to talk C: talking

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      The professor warned the students that on no account ________ use mobile phones in his class.

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      All flights have economy class, business class, and first class.

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      【单选题】如右图所示E-R图,【图片】 ,“teaches”是一个联系,下列描述其蕴涵的规则,正确的是_________。 A. 一个Professor可以给多个Class授课,一个Class可以由多个Professor来授课。 B. 一个Professor可以给多个Class授课,也可以不授课;一个Class必须有一个Professor来授课; C. 一个Professor可以给多个Class授课,也可以不授课;一个Class可以由多个Professor来授课,也可以不由任何Professor来授课; D. 一个Professor必须给一个Class授课;一个Class可以有多个Professor来授课,也可以没有Professor来授课; E. 其他都不正确