BELL DEMONSTRATED HIS INVENTION AT MANY EXHIBITIONS.QUESTION 3. CHO...

5. - BO DE LUYEN THI HSG ANH9 DAP AN
BO DE LUYEN THI HSG ANH9 DAP AN
5. Bell demonstrated his invention at many exhibitions.Question 3. Choose the option (a, b, c or d) that best completes each of the following sentences. (2.5 pts)