It is believed that ______ European chemist called Felix Hoffmann first produced ASA which completely changed ______ man’s understanding of aspirin.
| A．an; a | B．the; a | C．a; / | D．an; / |
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It is believed that ______ European chemist called Felix Hoffmann first produced ASA which completely changed ______ man’s understanding of aspirin.
| A．an; a | B．the; a | C．a; / | D．an; / |
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