题文
Whoever invented _______wheel is believed to have made ______most useful invention in _______history.
| A．a; the; / | B．the; the; / | C．the; a; / | D．a; a; the |
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Whoever invented _______wheel is believed to have made ______most useful invention in _______history.
| A．a; the; / | B．the; the; / | C．the; a; / | D．a; a; the |
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