— Do you know who _____ the tomb of Emperor Qin and who _____ the mobile phone? 
— No, but we may ask our teacher.

A. discovered; invented
B. was discovered; was invented
C. invented; discovered
D. was invented; was discovered
A
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— Do you know who _____ the tomb of Emperor Qin and who _____ the mobile phone? 
— No, but we may ask our teacher.

[     ]

A. discovered; invented
B. was discovered; was invented
C. invented; discovered
D. was invented; was discovered

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