Before becoming President in 1928, Herbert Hoover _____ as Secretary of Commerce. A
Before becoming President in 1928, Herbert Hoover _____ as Secretary of Commerce.
A. has served
B. was served
C. had served
D. serving
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A country that wishes to become a member of WTO is to send in its application before a working party is formed by WTO for examination of the specific conditions of the country.(英译中)