It is believed that ______ European chem
题型：选择题
问题：
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; /
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; /