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THE WIND ... AS A POWER SOURCE OVER 1,300 YEARS AG...
THE WIND ... AS A POWER SOURCE OVER 1,300 YEARS AGO IN PERSIA WHEN...
70 DE THI CHUNG CHI B TIENG ANH
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44. The wind ... as a power source over 1,300 years ago in Persia when the first windmill
was built to turn a millstone.
a. used
b. had been used
c. was used
d. was being used
c
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44.
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70 DE THI CHUNG CHI B TIENG ANH