题目内容

A_____ has taught us what atoms are made up of and how powerful the atom bomb is.

   A. seaman            B. salesman               C. naturalist             D. scientist

D

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249. A_____ has taught us what atoms are made up of and how powerful the atom bomb is.

A．seaman

B．salesman

C．naturalist

D．Scientist

 

He _______ in a university for five years, but now he runs a company of his own.

    A. has taught       B. had taught        C. taught           D. has been teaching

 

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