In the first century AD, Greek engineer Heron of Alexandria ______ the first wind wheel to operate a machine. a) invented b) had invented c) has invented d) was inventing
In the first century AD, Greek engineer Heron of Alexandria ______ the first wind wheel to operate a machine.
a) invented
b) had invented
c) has invented
d) was inventing
Гость
Ответ(ы) на вопрос:
Гостьa) invented .................................................
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