In the first century AD, Greek engineer Heron of Alexandria ______ the first wind wheel to operate a machine. a) invented b) had invented c)

Question

In the first century AD, Greek engineer Heron of Alexandria ______ the first wind wheel to operate a machine. a) invented b) had invented c)

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

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Ответ(ы) на вопрос:

Accepted Answer

a) invented .................................................