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---Do you know who ____ the tomb of Emperor Qin and who ___ the mobile phone? ---No, but we may ask ...
题目内容：
---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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